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Synthesis of trans-1,2-diphenyl-3,4-bis[4-(2,6-diphenyl-4H- pyranylidenyl)]cyclobutane: correction and structure proof

✍ Scribed by Jeffrey J. Doney; Chin H. Chen; Henry R. Luss

Publisher: Elsevier Science
Year: 1982
Tongue: French
Weight: 225 KB
Volume: 23
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(00)86730-1

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✦ Synopsis

The reaction of phenyl lithium acetylide (a) with 2,6-drphenylpyrylium perchlorate ( 2) is solvent dependent. With diethyl ether as solvent, the isolated product differed from that previously reported and is reassigned as 2,6-diphenyl-4-phenylacetylenyl_4H_-pyran (2). On the other hand, in TBF the title compound (5) was obtained; its structure was confirmed by single-crystal x-ray crystallography.

Aside from our general interest in the synthesis of pyrans and thiopyrans, 1 efforts to understand the chemistry of acetylenic and allenic pyrans were

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