Reference

Polycondensation of polyethylene polyamines with methyl esters of aliphatic dicarboxylic acids

Polycondensation of polyethylene polyamines with methyl esters of aliphatic dicarboxylic acids. Witek, Edward; Wlodarczyk, Miroslaw (Politech. Lodz, Lodz, Pol.). Zesz. Nauk. Politech. Lodz., Chem., 32, 137 (Polish) 1976. CODEN: ZNPLAY. DOCUMENT TYPE: Journal CA Section: 35 (Synthetic High Polymers) Diethylenetriamine (I) [111-40-0] and triethylenetetramine [112-24-3] were polymd. with dimethyl succinate [106-65-0], adipate [627-93-0], and sebacate [106-79-6]. The polymn. was carried out in melt in 160.degree. in vacuo. The concn. of primary amino groups decreased throughout the reaction of I with the respective ester, whereas reaction with the respective acid gave initial rapid decrease of primary amino groups followed by increase up to half the initial concn.

1,4-Dioxopyrrolo[3,4-c]pyrroles

1,4-Dioxopyrrolo[3,4-c]pyrroles. Rochat, Alain Claude; Cassar, Luigi; Iqbal, Abul (Ciba-Geigy A.-G. , Switz.). Eur. Pat. Appl. EP 94911 A2 23 Nov 1983, 32 pp. DESIGNATED STATES: R: AT, BE, CH, DE, FR, GB, IT, LI, NL, SE. (German). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C09B057-00; C08K005-34; C07D487-04. APPLICATION: EP 83-810202 11 May 1983. PRIORITY: CH 82-3054 17 May 1982; CH 82-5468 15 Sep 1982. DOCUMENT TYPE: Patent CA Section: 41 (Dyes, Organic Pigments, Fluorescent Brighteners, and Photographic Sensitizers) Section cross-reference(s): 28, 37 The title compds. (I; R, R1 = isocyclic or heterocyclic radicals), useful as orange to blue pigments for polymers, are prepd. by reaction of 1 mol succinic acid diester with 2 mol RCN or with 1 mol RCN and 1 mol R1CN, at high temp. in an org. solvent in the presence of a strong base, followed by hydrolysis. Thus, dropwise addn. of a soln. of 7.31 g MeO2CCH2CH2CO2Me (II) [106-65-0] in 5.0 mL tert-amyl alc. to an anhyd., N-blanketed mixt. of 48.2 mL tert-amyl alc., 17.3 g KOCMe3, and 72.2 g PhCN [100-47-0] at 98-99° with distn. 106-65-0 which is the cas registry number of one of substances is just one of reagents here. of liberated MeOH, heating at 99° for 2 h, cooling to 65°, diln. with 100 mL MeOH, neutralization with 10.8 mL HOAc, and heating at reflux gave 9.04 g (62.8% yield on II) I (R = R1 = Ph) [54660-00-3], a red pigment for PVC [9002-86-2]. Thirty-five other I were prepd. .