Pyrolysis of esters. XVIII. Synthesis of nitriles by pyrolysis of cyanoacetic esters was written by Bailey, William J.;Daly, John J. Jr.. And the article was included in Journal of the American Chemical Society in 1959.Recommanded Product: 2-Cyclohexylacetonitrile This article mentions the following:
The pyrolysis of cyanoacetic esters was investigated as a convenient method of synthesis for the corresponding nitriles. NCCH2CO2Et (169.5 g.), 118.8 g. EtAc, 11.7 g. NH4OAc, 18 g. AcOH, 300 cc. 95% EtOH, and 3 g. Pd-C hydrogenated 36 hrs. at room temperature yielded 223.5 g. EtMeCHCH(CN)CO2Et (I), b9 103-4.5鎺? n25D 1.4268. I (153 g.) added dropwise during 3.75 hrs. to a Vycor tube packed with glass helices at 520鎺?and the resulting pyrolyzate distilled yielded 63.7 g. EtMeCHCH2CN, b92 88鎺?n26D 1.4051. Et cyclohexylidenecyanoacetate (93 g.), b9 148-9鎺? n25D 1.4938, obtained in 83% yield by the condensation of cyclohexanone and NCCH2CO2Et, hydrogenated catalytically gave 86 g. Et cyclohexylcyanoacetate (II), b12 146-8鎺? n25D 1.4580. II (80 g.) pyrolyzed during 2 hrs. at 520鎺?gave 38.8 g. cyclohexylacetonitrile, b12 86鎺? n25D 1.4548. Na (46 g.) in 500 cc. absolute EtOH treated with 226 g. NCCH2CO2Et, stirred 15 min., treated rapidly with 254 g. (CH2CH2Cl)2, refluxed 48 hrs., treated with 46 g. Na in 500 cc. absolute EtOH, refluxed 72 hrs., and evaporated, the residue dissolved in H2O, the solution extracted with Et2O, and the extract distilled gave 200 g. 1-cyano-1-carbethoxycyclopentane (III), b18 118鎺? n25D 1.4452. III (101 g.), pyrolyzed during 2.8 hrs. at 510鎺?in the usual manner and the pyrolyzate fractionated gave 47.3 g. cyclopentanecarbonitrile, b20 67-8鎺? n25D 1.4403, and 11 g. unchanged III. Et2C(CN)CO2Et (57 g.), b10 92鎺? n27D 1.4200, pyrolyzed in the usual manner during 1.7 hrs. at 510鎺?and fractionated gave 20.5 g. Et2CHCN, b38 60-2鎺? n26D 1.3995, and 9.5 g. unchanged starting material. Na (18 g.) in 400 cc. absolute EtOH and 202 g. Br(CH2)3Br added simultaneously with stirring to 27.6 g. Na in 600 cc. absolute EtOH and 135.6 g. NCCH2CO2Et during 1 hr., heated 1.5 hrs., the EtOH distilled, the residue extracted with H2O, the extract re姣泋td. with C6H6, and the combined extract and original organic layer distilled yielded 110 g. 1-cyano-1-carbethoxycyclobutane (IV), b10 94.5-7.5鎺? n24D 1.4395. IV (39.5 g.) pyrolyzed during 1 hr. at 520鎺?and the product fractionated gave 7.5 g. crude CH2:CHCN, b. 76-7鎺?(BrCH2CHBrCN m. 131-2鎺?. EtMeC:C(CN)CO2Et (167 g.), b9 111-12鎺? n25D 1.4648, pyrolyzed during 3.75 hrs. at 510鎺?and the pyrolyzate fractionated gave 62.3 g. mixture of 80-5% EtMeC:CHCN and 15-20% MeCH:CMeCH2CN, b80-4 90-1鎺? n25D 1.4386, and 42 g. starting ester. Et cyclohexylidenecyanoacetate (158 g.) pyrolyzed during 3.2 hrs. at 510鎺?and the product fractionated gave 65.7 g. mixture of 85-90% 1-cyclohexenylacetonitrile and 5-10% cyclohexylideneacetonitrile, b10 89.5-90鎺? n25D 1.4832. In the experiment, the researchers used many compounds, for example, 2-Cyclohexylacetonitrile (cas: 4435-14-7Recommanded Product: 2-Cyclohexylacetonitrile).
2-Cyclohexylacetonitrile (cas: 4435-14-7) belongs to nitriles. Trimerization of aromatic nitriles requires harsh reaction conditions, high temperatures, long reaction times, and pressure. Nitriles are susceptible to hydrogenation over diverse metal catalysts. The reaction can afford either the primary amine (RCH2NH2) or the tertiary amine ((RCH2)3N), depending on conditions.Recommanded Product: 2-Cyclohexylacetonitrile
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts