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Mass spectra (MS) of 3-alkyl-4-cinnolinecarbonitrile (I) were examined. In MS of I, (M-·H)+ species are encountered only to a minor extent in the lower one in contrast with (M-·N2H)+ species. In particular it is worth noting that (M-·H)+ species are not found in MS of 3-methy1-(Ib) and 3-ethyl-4-cinnolinecarbonitrile (Ic). When the alkyl substituent at the 3-position of I such as methyl (Ib), ethyl (Ic), and propyl (Id), is not so bulky, the important fragmentation arises from the initial expulsion of ·N2H radical from M+. In turn, when the alkyl substituent is bulkier than that of isopropyl, the importance of this process is not recognized as seen in MS of 3-isopropyl-(Ie) and 3-butyl-4-cinnolinecarbonitrile (If). Those facts mentioned above mean that the ring cleavage of I by the initial expulsion of ·N2H radical is dependent on the relative size of the alkyl substituent at the 3-position.
収録刊行物
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- CHEMICAL & PHARMACEUTICAL BULLETIN
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CHEMICAL & PHARMACEUTICAL BULLETIN 25 (9), 2225-2230, 1977
公益社団法人 日本薬学会
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詳細情報 詳細情報について
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- CRID
- 1390282679145381248
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- NII論文ID
- 110003622712
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- NII書誌ID
- AA00602100
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- ISSN
- 13475223
- 00092363
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- 本文言語コード
- en
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- データソース種別
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- JaLC
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- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可