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題名 | Reaction of Carbon Disulfide and o-Phenylene Diamine Catalyzed by Quaternary Ammonium Salt in the Presence of Potassium Hydroxide=在氫氧化鉀存在下,以季銨鹽催化二硫化碳和鄰苯烯二胺反應之研究 |
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作者 | 劉炳郎; 王茂齡; | 書刊名 | 中國工程學刊 |
卷期 | 21:2 1998.03[民87.03] |
頁次 | 頁171-180 |
分類號 | 468.8 |
關鍵詞 | 合成2-硫醇基苯駢咪唑(MBI); 氫氧化鉀澳化四丁基銨觸媒效應; 反應機構; Synthesis of 2-mercaptobenzimidazole(MBI); Effect of KOH and TBAB catalyst; Reaction mechanism; |
語文 | 英文(English) |
中文摘要 | 在氫氧化鉀存在下,以季銨鹽為觸媒進行二硫化碳和鄰苯烯二胺反應合成2-硫醇 基苯駢咪唑(MBI)可以在以質子性溶劑或偽質子性溶劑中達成。反應中添加少量之水在於 溶解氫氧化鉀,而氫氧化鉀在反應中之角色可以利用依秩添加CS�砥AKOH,及C�碎��(NH��)�� 之條件及觸媒之添加量可以獲得。本論文同時倡導相間轉移觸媒反應之機構及動力模式。 由實驗結果得知,反應物在質子性溶劑及偽質子性溶劑中進行可以分別以零階及擬一階速率 律表示,研究中同時探討氫氧化鉀用量對反應物轉化率之影響。對於以季銨鹽為觸媒之催化 CS�祟MC�碎��(NH��)�砟坐狨陬痕G皆能得到滿意解釋,同時,我們也對反應速率做詳細之討 論。 |
英文摘要 | The synthesis of 2-mercaptobenzimidazole (MBI) from the reaction of carbon disulfide and o-phenylene diamine (C�碎��(NH��)��), catalyzed by tetrabutylammonium bromide (TBAB or QBr) in the presence of potassium hydroxide, was carried out in a homogeneous solution using protic or aprotic solvent. Water in a small amount was added to dissolve the KOH. The role of KOH in the reaction was investigated by conducting several independent experiments, which included a timed reaction of CS�畝nd KOH, and further reaction of C�碎��(NH��)��) in the presence or absence of TBAB catalyst in various sequential orders. A homogeneous reaction mechanism was proposed which supports the kinetic reaction model. The reactions were situated in protic and aprotic slovent and are described by zero-order and pseudo-first-order rate laws, respectively. The effect of the amoung of KOH on the conversion of C�碎��(NH��)�眨as also studied. The reaction was greatly accelerated both in the presence of TBAB catalyst and KOH. Satisfactory explanations were provided for the enhanced catalytic reaction of CS�畝nd C�碎��(NH��)�畜y TBAB compared with KOH. The reaction rates in these processes are also discussed in detail. |
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