The thermolysis of a series of 2-benzylidenebenzocyclobuten-1-ols has been studied. Whenever comparisons can be made, the rate of opening of the benzocyclobutene ring was slower for these compounds than the corresponding 2-ones. The intermediate vinylallenes underwent a variety of electrocyclization reactions which depended on the nature of the additional substituent at C-1. 10-Benzylideneanthrone and 4-benzylidene-l-tetralones, respectively, were obtained when this substituent was phenyl or vinyl. 1-(Alkynylphenyl)-2-benzylidenebenzocylobuten-1-ols were converted to mixtures of 4-benzylidene-1,4-naphthoquinonemethides, 2,3-dibenzylidene-1-indanones, and 10-phenylbenzo[b]fluoroeneone.
Synthesis of Polycyclic Compounds by the Reaction of Co2(CO)6Complexed 1-[o-(1-Alkynyl)phenyl]cyclopropanols
摘要:
1-[o-(1-Alkynyl)phenyl]cyclopropanols are converted to 2,3-dihydro-1-naphthalenone derivatives by heating their hexacarbonyldicobalt complexes in 2-propanol. Furthermore, a new type of isomerization-cyclization reaction proceeds to give 3a,4-dihydro-3H-cyclopenta[a]inden-2-one derivatives when the same reaction is carried out in the presence of DABCO.