Henry Rzepa's Blog Chemistry with a twist

December 16, 2010

Following one’s nose: a quadruple bond to carbon. Surely I must be joking!

Filed under: Hypervalency,Interesting chemistry — Tags: , , , , — Henry Rzepa @ 11:16 pm

Do you fancy a story going from simplicity to complexity, if not absurdity, in three easy steps? Read on! The following problem appears in one of our (past) examination questions in introductory organic chemistry. From relatively mundane beginnings, one can rapidly find oneself in very unexpected territory.


December 11, 2010

Janus mechanisms (the past and the future): Reactions of the diazonium cation.

Janus was the mythological Roman god depicted as having two heads facing opposite directions, looking simultaneously into the past and the future. Some of the most ancient (i.e. 19th century) known reactions can be considered part of a chemical mythology; perhaps it is time for a Janus-like look into their future.


June 1, 2010

Chemistry with a super-twist: A molecular trefoil knot, part 2.

Filed under: Interesting chemistry — Tags: , , , , — Henry Rzepa @ 1:14 pm

A conjugated, (apparently) aromatic molecular trefoil might be expected to have some unusual, if not extreme properties. Here some of these are explored. (more…)

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