This second report highlights two “themes”, or common ideas that seem to emerge spontaneously from diversely different talks. Most conferences do have them.
I am attending a conference. Plenaries at such events can sometimes provide interesting pointers on things to come (and sometimes they simply point to things past). At WATOC2014 in Santiago Chile, the first plenary was by Paul Ayers with the impressive title “Concepts for organising chemical knowledge” which certainly sounds as if it is pointing forward!
ELNs (electronic laboratory notebooks) have been around for a long time in chemistry, largely of course due to the needs of the pharmaceutical industries. We did our first extensive evaluation probably at least 15 years ago, and nowadays there are many on the commercial market, with a few more coming from opensource communities. Here I thought I would bring to your attention the potential of an interesting new entrant from the open community.
One molecule, one identifier: Viewing molecular files from a digital repository using metadata standards.September 8th, 2014
In the beginning (taken here as prior to ~1980) libraries held five-year printed consolidated indices of molecules, organised by formula or name (Chemical abstracts). This could occupy about 2m of shelf space for each five years. And an equivalent set of printed volumes from the Beilstein collection. Those of us who needed to track down information about molecules prior to ~1980 spent many an afternoon (or indeed a whole day) in the libraries thumbing through these weighty volumes. Fast forward to the present, when (closed) commercial databases such as SciFinder, Reaxys and CCDC offer information online for around 100 million molecules (CAS indicates it has 89,506,154 today for example). These have been joined by many open databases (e.g. PubChem). All these sources of molecular information have their own way of accessing individual entries, and the wonderful program Jmol (nowadays JSmol) has several of these custom interfaces programmed in. Here I describe some work we have recently done on how one might generalise access to an individual molecule held in what is now called a digital data repository.
- M. Harvey, N. Mason, and H.S. Rzepa, "Digital data repositories in chemistry and their integration with journals and electronic notebooks", Journal of Chemical Information and Modeling, pp. 140829132040008, 2014. http://dx.doi.org/10.1021/ci500302p
In the previous posts, I explored reactions which can be flipped between two potential (stereochemical) outcomes. This triggered a memory from Alex, who pointed out this article from 1999 in which the nitrosonium cation as an electrophile can have two outcomes A or B when interacting with the electron-rich 2,3-dimethyl-2-butene. NMR evidence clearly pointed to the π-complex A as being formed, and not the cyclic nitrosonium species B (X=Al4-). If you are wondering where you have seen an analogy for the latter, it would be the species formed when bromine reacts with an alkene (≡ Br+, X=Br- or Br3-). The two structures are shown below Since the topic that sparked this concerned pericyclic reactions, it seemed possible that if it had been formed, species B would immediately undergo a pericyclic electrocyclic reaction to form the rather odd-looking cation C, which might then be trapped by eg X(-) to form the nitrone D. So this post is an exploration of what happens when X-NO (X= CF3COO, trifluoracetate) interacts with 2,3-dimethyl-2-butene, as an illustration of what can be achieved nowadays from about 2 days worth of dry-lab computation as a prelude to e.g. an experiment in the wet-lab (it would take a little more than two days to achieve the latter I suspect). Hence computationally directed synthesis. The model is set up as ωB97XD/6-311G(d,p)/SCRF=chloroform. A transition state is located and the resulting IRC (below)  does not quite have the outcome the above scheme would suggest. Neither A nor B is formed; instead it is the tetrahedral species E, which is ~15 kcal/mol endothermic. I should immediately point out that this is not inconsistent with the formation of A as previously characterised. That is because this experiment was conducted with a non-nucleophilic counter-anion (X=Al4-), whereas in the computational simulation above, we have a nucleophilic anion (X= CF3CO2-). What a difference the inclusion of a counter-ion in the calculation can have! The barrier however (~35 kcal/mol) is a little too high for a facile thermal reaction. In the second of this two-stage reaction, E now ring-opens to form the anticipated D with quite a small barrier of ~6 kcal/mol, but a highly exothermic outcome. I ask this question about it; can this still be described as a pericyclic process? (there is some analogy to the electrocyclic ring opening of a cyclopropyl tosylate). So what are the conclusions? Well, because of the rather high initial barrier, the alkene will need activation (by electron donating substituents, perhaps OMe) for the reaction to become more viable. But if it works, it could be an interesting synthesis of nitrones (I have not yet searched to find out if the reaction is actually known).
- G.I. Borodkin, I.R. Elanov, A.M. Genaev, M.M. Shakirov, and V.G. Shubin, "Interaction in olefin–NO+ complexes: structure and dynamics of the NO+–2,3-dimethyl-2-butene complex", Mendeleev Communications, vol. 9, pp. 83-84, 1999. http://dx.doi.org/10.1070/MC1999v009n02ABEH000995
- Henry S Rzepa., "C8H12F3NO3", 2014. http://dx.doi.org/10.14469/ch/24979
- Henry S. Rzepa., "Gaussian Job Archive for C8H12F3NO3", 2014. http://dx.doi.org/10.6084/m9.figshare.1162797
- Henry S. Rzepa., "Gaussian Job Archive for C8H12F3NO3", 2014. http://dx.doi.org/10.6084/m9.figshare.1162676
This post, the fifth in the series, comes full circle. I started off by speculating how to invert the stereochemical outcome of an electrocyclic reaction by inverting a bond polarity. This led to finding transition states for BOTH outcomes with suitable substitution, and then seeking other examples. Migration in homotropylium cation was one such, with the “allowed/retention” transition state proving a (little) lower in activation energy than the “forbidden/inversion” path. Here, I show that with two electrons less, the stereochemical route indeed inverts. First, a [1,4] alkyl shift with inversion at the migrating carbon (ωB97XD/6-311G(d,p)/SCRF=chloroform); as a four-electron process, this is the “allowed” route. The “forbidden” route corresponds to retention of configuration at the migrating carbon. The barriers for each process can be seen below from the IRCs. That for inversion is ~4.5 kcal/mol lower than retention. This nicely transposes the values for the six-electron homologue shown in the previous post. There is one more nugget of insight that can be extracted. The start/end-point for the six-electron process (homotropylium cation) was, as the name implies, homoaromatic. Now, with a four-electron system we also have an inverse. Nominally, we should now end with homo-antiaromaticity (but see ). But antiaromaticity is avoided whenever possible, and so the homoaromatic bond observed in homotropylium is not formed. It resolutely remains a σ-bond (1.48Å) thus sequestering two electrons, and the remaining two electrons simply form a delocalised allyl cation. With the six-electron homotropylium, reactant/product were stabilised by that additional (homo)aromaticity, thus inducing a relatively high barrier. With the four-electron system here, no such reactant/product stabilisation occurs, and hence the reaction barriers are now significantly lower. A rather neat pedagogic example.
- Henry S. Rzepa., "Gaussian Job Archive for C8H11(1+)", 2014. http://dx.doi.org/10.6084/m9.figshare.1142175
- Henry S. Rzepa., "Gaussian Job Archive for C8H11(1+)", 2014. http://dx.doi.org/10.6084/m9.figshare.1142174
- C.S.M. Allan, and H.S. Rzepa, "Chiral Aromaticities. A Topological Exploration of Möbius Homoaromaticity", J. Chem. Theory Comput., vol. 4, pp. 1841-1848, 2008. http://dx.doi.org/10.1021/ct8001915
One thing leads to another. Thus in the previous post, I described a thermal pericyclic reaction that appears to exhibit two transition states resulting in two different stereochemical outcomes. I noted that another such reaction appeared to be a [1,6] carousel migration in homotropylium cation, where transition states for both retention and inversion of the configuration of the migrating group (respectively formally allowed and forbidden) were reported (scheme below). Here I explore this system further. Firstly, the pathway leading to inversion. The reaction path (ωB97XD/6-311G(d,p)/SCRF=chloroform) has got a very odd (table-top mountain) shape, whereby the region of the transition state (IRC = 0.0) is very flat, and the region close to reactant and (identical) product is very steep. The gradient norm shows this best, with sharp spikes at IRC ± 4.2. Something clearly is happening here to cause this behaviour. Before moving on to analyze this, I want you first to observe the methyl groups below. Note how one of them rotates at the start of the process, and the other at the end. I have elsewhere called this behaviour the methyl flag, and it is due to stereoelectronic re-alignments of the C-H groups accompanying the changes in the conjugated array. The homotropylium cation is said to be homoaromatic, indicating that cyclic conjugation can be maintained across a ring in which the σ framework is interrupted at one point. A NICS probe placed at the ring critical point of this molecule reveals a chemical shift of -11.3 ppm, very similar to eg that obtained for benzene itself. The three highest doubly occupied NBOs (below) show two normal π-type orbitals and one rather different one that spans the homo-bond (the MOs, before you ask, are a bit of a mess, with lots of mixed contributions from other parts of the σ framework).
- A.M. Genaev, G.E. Sal’nikov, and V.G. Shubin, "Energy barriers to carousel rearrangements of carbocations: Quantum-chemical calculations vs. experiment", Russian Journal of Organic Chemistry, vol. 43, pp. 1134-1138, 2007. http://dx.doi.org/10.1134/S1070428007080076
- Henry S. Rzepa., "Gaussian Job Archive for C10H13(1+)", 2014. http://dx.doi.org/10.6084/m9.figshare.1134556
- Henry S. Rzepa., "Gaussian Job Archive for C10H13(1+)", 2014. http://dx.doi.org/10.6084/m9.figshare.1135694
In my first post on the topic, I discussed how inverting the polarity of the C-X bond from X=O to X=Be (scheme below) could flip the stereochemical course of the electrocyclic pericyclic reaction of a divinyl system. This was followed up by exploring what happens at the half way stage, i.e. X=CH2, the answer being that one gets an antarafacial pathway as with X=O. Here I fill in another gap, X=BH to see if a metaphorical microscope can be used to view the actual region of the “flip” to a suprafacial mode. This time, uniquely, it proved possible to locate TWO transition states for this process, one suprafacial and one antarafacial, this latter being 10.5 kcal/mol lower in ΔG† (ωB97XD/6-311G(d,p)/SCRF=dichloromethane). It is quite rare to be able to find BOTH stereochemical outcomes of a thermal pericyclic reaction.‡
In my earlier post on the topic, I discussed how inverting the polarity of the C-X bond from X=O to X=Be could flip the stereochemical course of the electrocyclic pericyclic reaction of a divinyl system. An obvious question would be: what happens at the half way stage, ie X=CH2? Well, here is the answer. The reaction occurs in two stages (ωB97XD/6-311G(d,p)/SCRF=dichloromethane) but overall is a concerted, albeit asynchronous, reaction. The initial stage is a conrotatory ring closure (as observed with X=O but opposite to X=Be), and reaching what we will call a HI (hidden intermediate). This HI clearly has zwitterionic character, and manifests its presence most obviously at IRC = -3.5 below. The polarity of this HI is revealed by the dipole moment (6D) and molecular electrostatic potentials, below. The dipole vector goes from -ve to +ve, and the MEP clearly reveals the polarity below. This ionic HI however is not stable, and in the second stage of the reaction collapses to the neutral bicyclic hydrocarbon shown below. Overall, it amounts to a 2+2 cycloaddition, but with a very unusual pathway in which one C-C bond is very much formed before the other (which is how the reaction escapes the clutches of the Woodward-Hoffmann forbidden-ness). Why is all this worth this follow-up? Well, one can now start to “design” the reaction. All three carbon atoms with formal charges can be stabilised or destabilised with appropriate substituents. It should not be too difficult to stabilise out the HI into just an I(intermediate), or indeed to remove it from the profile. Nice perhaps for a group of students, who can partition up the substituents amongst themselves and discover if they have the desired effect. And would any of this tinkering change the stereochemical outcome?
- Henry S. Rzepa., "Gaussian Job Archive for C6H8", 2014. http://dx.doi.org/10.6084/m9.figshare.1128205
I do go on a lot about the importance of having modern access to data. And so the appearance of this article immediately struck me as important. It is appropriately enough in the new journal Scientific Data. The data contain computed properties at the B3LYP/6-31G(2df,p) level for 133,885 species with up to nine heavy atoms, and the entire data set has its own DOI. The data is generated by subjecting a molecule set to a number of validation protocols, including obtaining relaxed (optimised) geometries at the B3LYP/6-31G(2df,p) level. It would be good to replicate this set with inclusion of a functional that also includes dispersion, and of course making the coordinates all available in this manner greatly facilitates this. The collection also includes data for e.g. 6095 constitutional isomers of C7H10O2, which reminds me of an early, delightfully entitled, article adopting such an approach in quantum chemistry. Such collections are an important part of the process of validating computational methods This way of publishing data does raise some interesting discussion points.
- R. Ramakrishnan, P.O. Dral, M. Rupp, and O.A. von Lilienfeld, "Quantum chemistry structures and properties of 134 kilo molecules", Scientific Data, vol. 1, 2014. http://dx.doi.org/10.1038/sdata.2014.22
- Raghunathan Ramakrishnan., Pavlo O. Dral., Matthias Rupp., and O. Anatole von Lilienfeld., "Quantum chemistry structures and properties of 134 kilo molecules", 2014. http://dx.doi.org/10.6084/m9.figshare.978904
- P.P. Bera, K.W. Sattelmeyer, M. Saunders, H.F. Schaefer, and P.V.R. Schleyer, "Mindless Chemistry", J. Phys. Chem. A, vol. 110, pp. 4287-4290, 2006. http://dx.doi.org/10.1021/jp057107z
- P. Murray-Rust, H.S. Rzepa, J.J.P. Stewart, and Y. Zhang, "A global resource for computational chemistry", Journal of Molecular Modeling, vol. 11, pp. 532-541, 2005. http://dx.doi.org/10.1007/s00894-005-0278-1