Diphenylethane Derivative

The hypercoordinated diphenylmethane and diphenylethane derivatives [ CH2 (o-C6H4)2 (AuPPh3)4][BF4]2 and [ CHjCH -QH KAuPPhaMBF can be synthesized by auration of the corresponding dinuclear neutral species with [AuPPhi 11BF4] (1 2) as shown in Eq. (42).75... 

Carbon-Carbon Bond Cleavage in Radical Cations of Diphenylethane Derivatives... 

Mesolytic cleavage in radical anions of 1,2-diphenylethane derivatives... 

Benzene or cyclohexane rings can still pass through the a-CD ring, but they are already too thick to be complexed within the center of the a-CD cavity. Therefore, only rather unstable ICs are formed, in which the ring is situated at the wider secondary rim of the a-CD cavity. They are called shallow ICs. Benzoic acid derivatives are complexed exceptionally well and deeply, since the COOH group prefers to remain in the cavity [121], Biphenyl derivatives are not bound at all as well as the dibromo-diphenylethane derivative in Fig. 7. 

A recent brief study of the photochemistry at 254 nm in tetrahydrofuran (THF) of the fluorinated 1,2-diphenylethane derivatives, 100, reported very low and inefficient conversions to the corresponding stilbene derivatives, Eq. (36) [138]. The addition of a radical inhibitor, 2,6-di-t-butyl-4-methylphenol, had no effect. The mechanism for the loss of hydrogen fluoride is therefore not known. Irradiation in the presence of LiAlHt gave reduction products and the mechanism proposed begins with electron transfer from the hydride to the excited state of the substrate to form a radical ion pair. 

Welch et al., 1969 Cecil et al., 1971). After the discovery of the oestrogen action of o,p -DDT, Bitman and Cecil (1970) established in their comparative investigations that those diphenylmethane and diphenylethane derivatives have an oestrogen action in which at least one of the two p-positions is unsubstituted or carries a hydroxy or a methoxy substituent. A further factor connected with bioactivity is that o,p -DDT has two enantiomeric forms (McBlain et al., 1976 1977). 

In some cases oxidative union of two carbon atoms can be used for preparation of diphenylethane derivatives House295 describes a simple synthesis of 4,4 -dinitrobibenzyl from p-nitrotoluene ... 

S, 29] in the nematic phase has been clearly demonstrated [30, 31]. Similar SANS results have recently been reported for a polyether based on a diphenylethane derivative [32]. 

Tricyclic ketones with an angular methyl group have been obtained from readily available 1,2-diphenylethane derivatives in superacidic medium . ... 

Rogulska, M., Podkoscielny, W., Kultys, A., Pikus, S., Pozdzik, E. (2006), Studies on thermoplastic polyurethanes based on new diphenylethane-derivative diols. Part 1 Synthesis and characterization of nonsegmented polyurethanes from HDl and MDl, Eur. Polym. J., 42,1786-97. 

Syntheses via Diphenylethane Derivatives. Total syntheses of doisynolic acids, their 8-aza analogs, and numerous tricyclic ABC intermediates have been effected by this route (Schemes 48-51). 

Fragmentation of the nitrilium ion interferes with the cyclization - of 1,2-diphenylethane derivatives, leading to formation of stilbenes rather than cyclization products. This problem has been overcome by using Oxalyl Chloride instead of (1). Fragmentation (von Braun reaction or retro-Ritter reaction) occurs... 

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