20783-41-9Relevant academic research and scientific papers
Small Rings, 35. Attempts to synthesize tetramethyltetrahedrane from heterocyclic precursors
Maier, Guenther,Schneider, Manfred,Kreiling, Gerda,Mayer, Wolfram
, p. 3922 - 3934 (2007/10/02)
By comparison of the photochemical behaviour of heterocycles 1 and 3 under matrix conditions it should be possible to prove the existence of tetramethyltetrahedrane (5).Whereas irradiation of 1 leads to the charge-transfer complex 32, the same is not true for 3 in spite of the fact that after warm-up the products, namely dimer 31 of tetramethylcylobutadiene (4) and tetramethylpyridazine (2), are identical in both series.Intermediate formation of tetramethyltetrahedrane is one but not the only way for mechanistic interpretation of the experimental findings.
Small rings, 36. Attempts to Synthesize Tetramethyltetrahedrane from Alicyclic Precursors
Maier, Guenther,Mayer, Wolfram,Freitag, Hans-Albrecht,Reisenauer, Hans Peter,Askani, Rainer
, p. 3935 - 3958 (2007/10/02)
Synthesis as well as the thermal and photochemical behaviour of compounds with ring skeletons 1 and 3 are described.Whereas the former are accessible by standard procedures the approach to the bicyclobutane derivatives is based on the isomerization of diester 1b into valence isomer 3b which can be achieved in good yield by SiO2 or Al2O3.There are only minor differences in the cleavage of the pairs 1/3 provoked by heating or photochemical excitation.This is even true for irradiations in argon at 10 K.Under those conditions anhydrides 1a and 3a form the samecharge transfer complex 28a between tetramethylcyclobutadiene and phthalic anhydride.A direct detection of tetramethyltetrahedrane using these means is not possible.
