Extremely Crowded Biaryls
Extremely Crowded Biaryls
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极其拥挤的联芳基化合物
DOI:
10.1002/ejoc.202100399
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发表时间:
2021
影响因子:
2.8
通讯作者:
Pascal, Jr., Robert A.
中科院分区:
文献类型:
--
作者:
Du, Yuchen;Mague, Joel T.;Pascal, Jr., Robert A.
Highly congested derivatives of biphenyl were prepared by double Diels‐Alder reactions of cyclopentadienones with substituted butadiynes. The reaction of 2,3,5‐tri(tert‐butyl)cyclopentadienone (5) and diphenylbutadiyne (3) gave only the single adduct, 1‐(phenylethynyl)‐2‐phenyl‐3,5,6‐tri‐tert‐butylbenzene (6), and even extreme conditions gave no second addition. When tetracyclone (4) was added to bis(trimethylsilyl)butadiyne (8), two additions were achieved, but one silyl group was lost either during, or immediately following, the second addition to give 2‐(trimethylsilyl)‐2′,3,3′,4,4′,5,5′,6‐octaphenylbiphenyl (11). However, when 3,4‐diphenyl‐2,5‐dimethylcyclopentadienone (12) was added to8, the fully substituted 2,2′‐bis(trimethylsilyl)‐4,4′,5,5′‐tetraphenyl‐3,3′,6,6′‐tetramethylbiphenyl (14) was formed. The X‐ray structures of compounds11and14show them to be quite crowded, but the central biphenyl rings do not exhibit the distortions previously observed in decaphenylbiphenyl. In an alternative approach, arynes were added to 5,5′‐bis(4‐chlorophenyl)‐3,3′,4,4′‐tetraphenyl‐2,2′‐bis(cyclopentadienone) (18). Simple benzyne added twice to give 4,4′‐bis(4‐chlorophenyl)‐2,2′,3,3′‐tetraphenyl‐1,1′‐binaphthyl (19) in low yield, but tetraphenylbenzyne, generated from tetraphenylanthranilic acid, added only once.
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DOI:
--
发表时间:
1988
期刊:
影响因子:
--
作者:
S. Biali;B. Kahr;Y. Okamoto;R. Aburatani;K. Mislow
通讯作者:
K. Mislow
DOI:
--
发表时间:
2019
期刊:
影响因子:
--
作者:
中村賀美;竹内孝江
通讯作者:
竹内孝江
影响因子:
2.9
作者:
R. Pascal
通讯作者:
R. Pascal
DOI:
--
发表时间:
1979
期刊:
影响因子:
--
作者:
A. Nishinaga;Tadashi Shimizu;T. Matsuura
通讯作者:
T. Matsuura
DOI:
--
发表时间:
1938
期刊:
影响因子:
--
作者:
C. Koelsch;T. A. Geissman
通讯作者:
T. A. Geissman