合成制备方法
3Mg + 2P → Mg₃P₂
使用氢气流携带磷蒸气通过热镁粉制得Mg₃P₂。进行反应的仪器装置如图Ⅱ-5所示:1和2为硬质玻璃制成的反应舟,其中1装有5克红磷,2装有4克不含氧化镁的纯镁粉。通过活塞3抽真空并通入H₂,出口4为氢气出口,分别用电炉5和6加热舟1和舟2。初始温度设定为600℃,反应结束时将温度提升至700℃以驱除过量的磷。
在舟2中生成了Mg₃P₂结晶,在继续通入H₂的情况下打开管口4,用玻璃棒将舟1和舟2推至管端8处,再将舟2拉回十字口9处,翻转舟2使磷化镁落入竖管下端10。封闭管口4后,打开竖管端口11,伸入玻璃棒捣碎10处的Mg₃P₂。在持续通氢气的情况下,将磨口12以下部分取下,并立即用磨口帽封闭磨口12。通过活塞3连接黄铜皱纹管与真空泵和H₂发生器(不可使用橡皮管,因为可能会释放湿气)。倾斜装置使Mg₃P₂粉末倒入球形小瓶13和毛细管试样管14中,并将其熔封保存。
Quinazoline derivatives, substituted in the 2-position by the residue of a cyclic (especially heterocyclic) amino compound of aromatic character (particularly an aminothiazole compound) and in the 4-position by the residue of an amino compound of aliphatic character (the aliphatic chain of which may be interrupted by a hetero atom such as oxygen or sulphur) containing a further strongly basic group (e.g. a dialkylamino, piperidino or morpholino group), are manufactured by heating a 2 : 4-dihalogenquinazoline (which may contain further substituents) with the two amines simultaneously, advantageously in the presence of a diluent (e.g. water, alcohol, dioxane or nitrobenzene), if desired under pressure. Examples describe the reaction of 2 : 4-dichloroquinazoline with b -diethylaminoethylamine and simultaneously with: (1) 2-amino-4-phenylthiazole; (2) and (3) p-chloraniline. Lists are given of further products, involving the following additional reactants: 2 : 4 : 6-trichloroquinazoline; 2-aminobenzthiazole and its 6-methyl, chloro, methoxy, nitro, cyano, n-butoxy, acetylamino, methylsulphonyl, benzyl, sulphonamido and phenoxy derivatives, 2-amino-4-methyl- and -4 : 7- and -4 : 6-dimethyl-benzthiazole, 2-aminothiazole, 2-aminobenzimidazole and its 6-methyl derivative, 2 - amino - 6 : 7 - benzobenzthiazole, 2 - amino - 4 - (p - tolyl) - and - 4 - (p - bromophenyl) - thiazole, 2 - amino - 4 : 5 - diphenylthiazole, p - toluidine, p - anisidine, and b - naphthylamine; g -diethylaminopropylamine, b -piperidinoethylamine, 1 - diethylamino - 3 - butylamine, and b - (b 1 - diethylaminoethylthio)-ethylamine.