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Einhom

Polycarbonates were first prepared by Einhom in 1898 by reacting the dihydroxybenzenes, hydroquinone and resorcinol, separately with phosgene in solution in pyridine. The hydroquinone polycarbonate was an infusible and insoluble crystalline power whereas the resorcinol polymer was an amorphous material melting at about 200°C. The third dihydroxybenzene, catechol, yields a cyclic carbonate only, which is not surprising bearing in mind the proximity of... [Pg.556]

Eegonine is readily esterified in presence of hydrogen chloride, and this way various alkylecgonines have been prepared. The most impKartai of these is the methyl ester, b.p. 177°/15 mm., which according to de Jong occurs in Java coca. It was prepared by Einhom and Klein in 1888 i the hydrochloride crystallising, with 1 HjO, in colourless prisms, m.p. 21... [Pg.96]

S. Nelieu, M. Stobiecki and J. Einhom, Tandem solid-phase extraction of ati azine ozonation products in water , / Chromatogr. 866 195 - 201 (2000). [Pg.131]

Einhom J, Einhom C, Ratajczak F, Durif A, Averbuch MT, Pierre JL. Tetrahedron Lett. 1998 39 2565-2568. [Pg.424]

Polycarbonates are polyesters of phenols and carbonic acid. Polycarbonates are polymer containing O CO O groups. They were prepared accidentally in 1989 by Einhom by the action of phosgene with hydroquinone. He also prepared a resin by reacting phosgene with resorcinol. Bischoff and Hedenstrom in 1902 reacted dihydricphenols with diphenylcarbonate to get insoluble materials. Carothers and others prepared aliphatic Polycarbonates in 1930 but they were of no commercial importance. [Pg.190]

How is m-hydroxybenzoic acid prepared Discuss the reduction of salicylic acid to pimelic acid (Einhom). [Pg.250]

See other pages where Einhom is mentioned: [Pg.32]    [Pg.280]    [Pg.266]    [Pg.290]    [Pg.621]    [Pg.104]    [Pg.174]    [Pg.3]    [Pg.523]    [Pg.27]    [Pg.112]    [Pg.112]    [Pg.604]    [Pg.636]    [Pg.836]    [Pg.1102]    [Pg.1277]    [Pg.1279]    [Pg.1573]    [Pg.1747]    [Pg.1748]    [Pg.185]    [Pg.185]    [Pg.401]    [Pg.401]    [Pg.1073]    [Pg.1074]    [Pg.284]    [Pg.285]    [Pg.285]    [Pg.214]    [Pg.205]    [Pg.424]    [Pg.368]    [Pg.323]    [Pg.91]    [Pg.23]    [Pg.29]    [Pg.622]    [Pg.41]    [Pg.57]    [Pg.57]    [Pg.57]    [Pg.397]    [Pg.397]   
See also in sourсe #XX -- [ Pg.3 , Pg.266 ]

See also in sourсe #XX -- [ Pg.3 , Pg.266 ]



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