2- Butyne 1.4- diphenyl

Benzophenone does not react under these conditions. However, when a prior transmetallation between 30 and phenyllithium is performed, and the new organolithium compound is allowed to react with benzophenone, the homopropagylic alcohol l,l-diphenyl-3-butyn-l-ol 32 is obtained in 69% yield (Equation (16)).49... 

Dienylation of alkynes proceeds in the presence of Co catalysts, and the conjugated diene system is retained in the adducts. The conjugated trienes 120 and 121 are obtained from 2-butyne (119) and butadiene [44]. The dienylation occurs to give the conjugated l,8-diphenyl-l,3,5,7-octatetraene (122) by attack of two phenylacetylene molecules to both side of butadiene [42a]. 

The alkyne complex (68) reacts with two equivalents of ethene to give the 5-cfr-3,4-( )-diphenyl-l,3-hexadiene complex (69) as shown in Scheme 39. Use of 2-butyne leads to the metallacycle (70) via bis(alkyne) complex. " The bicyclic vanadacyclopentatriene complex (71) is formed from 1,7-nonadiyne. 

SYNS 2-BUTYNE, 1-CHLORO-4-MERCAPTO-, S-ESTER WITH DIPHENYLPHOSPHINOTHIOATE PHOS-PHINOTHIOIC ACID, DIPHENYL-, S-(4-CHLORO-2-BUTYNYL) ESTER... 

Methylphenylacetylene (1-phenylpropyne), fert-butylphenylacetylene (1-phenyl-3,3-dimethyl-l-butyne), biphenylene, and diphenylacetylene (diphenyl-ethyne) were prepared by reliable methods. The other hydrocarbons were purchased and then purified until they met published criteria of purity (i.e., mp, thin layer chromatography, IR, and UV). The same procedure was followed for phenoxathiin, phenothiazine, and thianthrene. Finally, silicon derivatives of alkynes, alkenes, alkadienes, and arenes were made according to published procedures. 

Diphenyl-5-(4-methoxyphenyl)-l,2,3-triazine has been converted to (4-methoxyphenyl)phenylethyne at 625°C/10 Torr <1981JCM162>. Beyond the preparation of two perfluoroalkynes, namely perfluoro-3-methyl-l-butyne from perfluoro-4,6-diisopropyl-l,2,3-triazine (600 °C, 10 Torr) <1989CC1657> and difluoroethyne from... 

As model compounds we have chosen (3-hydroxy-l-propenyl)tris(trimethylsilyl)silanes (4a-c), which were obtained by AIBN-initiated additions of tris(trimethylsilyl)silane (3) to propargylic alcohol, 2-methyl-3-butyn-2-ol and l,l-diphenyl-2-propyn-l-ol, respectively (Eq. 1). In agreement with literature data [3], in the case of the reaction of 3 with propargylic alcohol the Z-olefin 4a was obtained. NMR studies of 4b and 4c revealed an E-configuration for the two olefins. 

Butyllithium (1.5 M in hexane) added to a soln. of phenylacetylene in THF at 0°, warmed to room temp., solvent removed in vacuo, cooled to —50°, the obtained Li-acetylide dissolved in THF, treated with 1 eq. ClTi(OPr-/)3 (1.59 Min THF), a 1 M soln. of styrene oxide in THF added at —50°, warmed to room temp, within 2 h, stirred for 3 days, and hydrolyzed with 1 AHCl - 2,4-diphenyl-3-butyn-l-ol. Y 70%. Alkyloxiranes gave only 10% of the expected product. F.e. inch ring opening of alkenyl-, alkynyl-, and trimethylsilyl-oxiranes, s. N. Krause, D Seebach, Chem. Ber. 121, 1315-20 (1988). 

The Diels-Alder adduct formed by treating furan with hexafluorobut-2-yne has been subjected to a retro-Diels-Alder reaction acetylene is eliminated and the reaction provides a route to 3,4-bis(trifluoromethyl)furan. The corresponding cycloadduct (154) formed from l,l-dimethyl-2,5-diphenyl-sllacyclopentadiene and the butyne was decomposed in an attempt to generate dimethylsilylene by a symmetry-allowed cheletropic fragmentation (Scheme 50) 836 evidence for silylene formation could be obtained unless the decomposition was effected photochemically or in refluxing cumene, under which conditions the addition of tolan enabled dimethylsilylene to be trapped... 

In contrast, tetraphenyldiazocyclopentadiene and l,2-diphenyl-3,4-benzo-diazocyclopentadiene react with the butyne under identical conditions to give only benzpyrazoles, e.g. (167). ... 

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