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2,3-二甲基-1,3-丁二烯

2,3-二甲基-1,3-丁二烯

CAS号:513-81-5
英文名:2,3-Dimethyl-1,3-butadiene
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化合物简介
Dimethylbutadiene, formally referred to as 2,3-dimethyl-1,3-butadiene, is an organic compound with the formula (CH3)2C4H4. It is colorless liquid which served an important role in the early history of synthetic rubber. It is now a specialty reagent.
基本信息
编号系统
物化性质
安全信息
生产方法及用途
生产方法
1.由频哪醇(四甲基乙二醇)经氢溴酸催化脱水即得。将频哪醇和48%氢溴酸慢慢加热,收集馏出液直至95℃为止。取上层液用含少量对苯二酚的水洗涤,以无水氯化钙干燥,再经分馏即得成品。
2.制法: 于反应瓶中加入干燥的频哪醇
(2)177g(1.5mol),5mL恒沸氢溴酸(47%~48%),几粒沸石。装上一只效率较高的分馏柱,分馏柱上安上冷凝器和接受装置。油浴加热反应瓶,控制镏出速度约每分钟20~30滴。慢慢收集馏出物,直至分馏柱顶部温度达到95℃,约需1h,分出馏出物种的上层,水洗两次。加入0.25g的苯酚作为阻聚剂,无水氯化钙干燥过夜。分馏,收集69~70.5℃的馏分①,得2,3-二甲基-1,3-丁二烯②
(1)70g,收率57%。注:①蒸馏 时最后收集105~106℃的馏分,为频哪酮,约35g。②产品容易聚合,应加入约0.3%的苯酚作为阻聚剂,并密闭后低温保存。
用途
用于合成橡胶和聚合物的制造。
下游产品
6,7-dimethyl-1,3,6-octatriene 1-异丙基-3,4-二甲基-3-环戊烯-1-醇 苯基三甲基锗烷 2,3-二甲基己烷 三甲基锗烷 2,3,6,7-tetramethyl-1,3,6-octatriene 3,4-dimethylcyclohex-3-ene-1-carboxylic acid 3,4-二甲基-1H-吡咯-2-羧醛 3,6-Dihydro-2,2-bis(4-methoxyphenyl)-4,5-dimethyl-2H-thiopyran 6,7-dimethyl-5,8-dihydro-1,2,3,4-tetrathiocine 2-(4-chlorophenyl)-4,5-dimethyl-3,6-dihydrooxazine 三苯基氯甲烷 3,4-dimethyl-6-(diphenylphosphoryl)-2H-thiopyran 2,4,5-trimethyl-3,6-dihydro-2H-thiopyran 5,6-二甲基-3a,4,7,7a-四氢-2-苯并呋喃-1,3-二酮 4,5-dimethyl-2-(dimethylphosphoryl)-3,6-dihydro-2H-thiopyran S-oxide 4,4'-二甲氧基二苯甲酮 1-苯基-1H-四唑 1,2-dimethyl-4-prop-1-enylcyclohexene 2,3,7,8-tetramethyl-5-germaspiro[4.4]nona-2,7-diene 三苯甲硫醇 3,4-dimethyl-6-(diethoxyphosphoryl)-2H-thiopyran 3,4-dimethylcyclohex-3-ene-1-carbonitrile 2,3-dimethyl-5-germaspiro[4.4]nona-2,7-diene o-(trimethylsilyl)(2,3-dimethyl-3-butenyl)dimethylgermylbenzene 9,10-二甲基蒽 1,2-dithia-4,5-dimethyl-4-cyclohexene 3,4-二甲基-3-环己烯甲醛 1,1,3,4-四甲基-1-锗杂-3-环戊烯 6,7-二甲基-1,2,3,4-四氢萘 ethyl 3,6-dihydro-4,5-dimethyl-2H-selenine-2-carboxylate 2,4,5-三甲基吡啶 3,4-bis(bromomethyl)furan 2,5-二甲基-1-苯基-1H-砷杂茂 (E,E,E)-S2,4,6-辛三烯 dimethylphenylgermane 1,3,4-Trimethyl-1-sila-3-cyclohexen dimethyl 4,5-dimethylcyclohexa-1,4-diene-1,2-dicarboxylate 1,2-双(三氟甲基)苯 3,4-Dimethyl-1-sila-3-cyclohexen 1,3,4-三甲基-3-环己烯-1-羧醛 2-(diphenyl)phosphoryl-3,6-dihydro-4,5-dimethyl-2H-thiopyran S-oxide dimethyl(phenyl)germanium 5,6-二甲基-2,3-二氢-异吲哚-1-酮 对氯苯胺 1,3,4-trimethyl-2,5-dihydrophosphole 3,4-dimethyl-2,5-dihydropyran-6-one 马来酸二乙酯 2-(diethoxy)phosphoryl-5,6-dihydro-3,4-dimethyl-2H-thiopyran S-oxide