METHOD FOR PRODUCING DIMETHYLAMINE BORANE Russian patent published in 1998 - IPC

FIELD: microelectronics, as reducing agent at chemical precipitation of metals; organic chemistry, as selective reducing agent; as stabilizing agent for organic products. SUBSTANCE: dimethylamine borane is prepared by interaction of dimethylamine with gaseous diborane, the process is carried out by mixing at temperature up to 50 C. Then purification and isolation of final product are carried out. Mixing is carried out by equimolar feeding of origin reagents, and diborane is fed in two steps. At the first step 65-85 % of diborane are fed, the process takes place at (-10) - 0 C. At the second step the residual portion of diborane is fed, the temperature being gradually increased to 50 C. Then reaction mass is allowed to stand at 40-50 C within at least 5 h, the process is followed by purification of final product by crystallization. Crystallization takes place of solvent, its quantity being 1.5-2-fold excess. Water or methyl borate or tert-butyl chloride are preferably used as said solvent. Crystallization takes place at 10 -(-25) C. Content of main substance in desired product is 99.0-99.5 %, yield of crystalline dimethylamine borane is 79.0-90.4 %. Proposed method is simple in its realization, it does not need sufficient investment by producing dimethylamine borane. EFFECT: higher efficiency. 3 cl, 2 tbl