127635-90-9Relevant articles and documents
Intramolecular [2 + 2] photocycloaddition. 10. conformationally stable syn-[2.2]metacyclophanes
Nishimura, Jim,Horikoshi, Yoichiro,Wada, Yasuhiro,Takahashi, Hideo,Sato, Mitsuo
, p. 3485 - 3489 (2007/10/02)
Three isomerized 1,2:9,10-diethano-syn-[2.2] metacy elephants 5, 6, and 7 were prepared from cis-1,2-bis(mvinylphenyl)cyclobutane by photocycloaddition. Their yields were 10, 5, and 3%, respectively. 1H NMR chemical shifts of aromatic protons f