- Photolysis of p-Phenylbis(chlorodiazirine), Studied by Matrix Isolation Spectroscopy. Generation, Detection and Characterization of p-Phenylenebis(chloromethylene)
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Photolysis of the title bis-diazirine matrix-isolated in Ar at 10 K monitored by IR and UV/vis spectroscopy indicated that the diazirine underwent stepwise elimination of N2 to produce 3-(4-chlorocarbenophenyl)-3-chlorodiazirine which then eliminated the
- Tomioka, Hideo,Komatsu, Kazunori,Nakayama, Takehito,Shimizu, Masayoshi
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p. 1291 - 1294
(2007/10/02)
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- Method for preparing hydroquinone and hydroquinone-bisphenol a Bischloroformates
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Bischloroformates of bisphenol compositions comprising hydroquinone or a hydroquinone-bisphenol A mixture are prepared by passing phosgene into a vigorously agitated mixture of water, an alkaline earth metal hydroxide, the bisphenols and a substantially inert, water-immiscible organic liquid such as methylene chloride. The molar ratio of water to alkaline earth metal hydroxide is in the range of about 3-8:1. The bisphenols and at least a portion of the organic liquid are preferably initially present in the reaction mixture, and the alkaline earth metal hydroxide is preferably added during phosgenation.
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- Process for preparing hydroxylated aromatic compounds
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A process for preparing hydroxylated aromatic compounds optionally bearing at least one trifluoromethyl, trifluoromethoxy or trifluoromethylthio group. A chloroformate or fluoroformate, optionally bearing at least one trihalomethyl-, trihalomethoxy- or trihalomethylthiophenyl group, is reacted with liquid hydrofluoric acid. The aromatic compounds obtained are useful as synthesis intermediates in the pharmaceutical or the plant-protection industry.
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- Bis(aminoneopentyl) aromatics
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Aromatic-aliphatic diamines of the formula STR1 in which Ar is an arylene or substituted arylene are useful in preparing thermally stable, rigid, polyamides, polyureas and polyurethanes having a repeating unit of the formula STR2 in which Ar is arylene or substituted arylene, X is --NH-- or --O--, n is 0 or 1, and R is a divalent organic radical.
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