Electric Literature of 1122-85-6,Some common heterocyclic compound, 1122-85-6, name is Phenyl Cyanate, molecular formula is C7H5NO, traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
EXAMPLE 1 A solution of 2.60 g of 4-(2,2-dibromovinyl)-4′-pentylbiphenyl in 50 ml of absolute tetrahydrofuran was placed at -78 C. in a sulphonation flask under argon gasification and treated within 5 minutes with 14.5 ml of a 1.2N solution of butyl lithium in hexane. After completion of the addition, the mixture was warmed to -10 C. within 10 minutes and then, after renewed cooling to -78 C., treated with a solution of 1.5 ml of phenyl cyanate in 10 ml of absolute tetrahydrofuran. The mixture was subsequently stirred at -78 C. for a further 30 minutes, then poured into 100 ml of water and extracted three times with 100 ml of diethyl ether each time. The organic phases were washed twice with 50 ml of water each time, dried over magnesium sulphate and concentrated. Low-pressure chromatography (0.5 bar) of the residue (2.51 g) on silica gel with hexane followed by 2% ethyl acetate/petroleum ether and subsequent recrystallization from methanol gave 1.02 g (58%) of (4′-pentyl-4-biphenylyl)propiolonitrile as colourless crystals (purity 99.6%); m.p. (C-N) 51.0 C., cl.p. (N-I) 120.2 C. The 4-(2,2-dibromovinyl)-4′-pentylbiphenyl used as the starting material was prepared as follows:
The synthetic route of 1122-85-6 has been constantly updated, and we look forward to future research findings.
Reference:
Patent; Hoffmann-La Roche Inc.; US4528114; (1985); A;,
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