一二三四区视频,亚洲少妇熟女色,日本久热无码视频网,欧美国产日韩大尺度,亚洲a视频,久久少妇一区二区,日韩999无码视频,刺激久久久久久久,啊啊啊啊不要啊在线

Resonance in Formamide

May 28,2026

Amide structure and reactivity is conventionally interpreted within the framework of resonance theory. Formamide, the simplest amide, is poorly represented by the single Lewis structure I (X=O). Its planar geometry, large rotation barrier (18-19 kcal mol-1), and red-shifted carbonyl stretching frequency can be readily understood in terms of the strong resonance mixing of the dipolar form II. In contrast to typical pyramidal amine geometries, the planar amino group is stabilized by the resonance interaction of the p-type N lone pair with the carbonyl π system. The resulting CN double-bond character gives rise to the large rotation barrier, while the loss of CO double-bond character leads to a low CO stretching frequency.

formamide resonance structures

In formamide, the sizable contribution of the dipolar form accounts for the planar amino geometry, large rotation barrier, and relatively short CN bond length. The weight of the dipolar form increases monotonically from formamide to telluroformamide in accord with the increasing rotation barrier and decreasing CN bond length. The larger polarizabilities of the heavier chalcogens allow these atoms to accommodate more charge density than anticipated on the basis of electronegativity.

Reference

[1] Glendening, E. D., & Hrabal, J. A. (1997). Resonance in Formamide and Its Chalcogen Replacement Analogues: A Natural Population Analysis/Natural Resonance Theory Viewpoint. Journal of the American Chemical Society, 119 52, 12940–12946. https://doi.org/10.1021/ja970074j

  • Related articles
  • Related Qustion
  • The structure of Formamide May 7, 2024

    Formamide, the simplest carboxylic acid amide, is a viscous, odorless, colorless liquid with a melting point of 2 oC and a boiling point of 210 oC.

  • Formamide: Applications, toxicity, storage and Preparation Apr 27, 2023

    Formamide is an organic compound with the molecular formula HCONH2. It is a colorless, pungent-smelling liquid at room temperature.Formamide finds wide usage in the chemical industry as a solvent.

  • What is Formamide? Feb 20, 2020

    Formamide is the simplest monocarboxylic acid amide, obtained by formal condensation of formic acid with ammonia. The parent of the class of formaldehydes. Formamide has a role as a solvent.

See also
4

The cyanate ion (NCO-) is a common triatomic polyatomic anion, widely studied in general chemistry due to its unique bonding behavior and multiple electron distribution.....

May 28,2026Organic reagents

Formamide

75-12-7

Formamide manufacturers

  • FORMAMIDE
  • 75-12-7 FORMAMIDE
  • 2026-06-03
  • CAS:75-12-7
  • Min. Order: 1KG
  • Purity: 99%
  • Supply Ability: 20tons
  • Formamide
  • 75-12-7 Formamide
  • 2026-05-31
  • CAS:75-12-7
  • Min. Order: 1kg
  • Purity: 99%
  • Supply Ability: 99999

博罗县| 福州市| 兴安县| 扶余县| 淳安县| 海原县| 尤溪县| 嘉义市| 南城县| 鲁甸县| 沐川县| 新密市| 遵义县| 济宁市| 都江堰市| 嘉禾县| 平定县| 静安区| 旺苍县| 溆浦县| 巴中市| 延安市| 三明市| 绩溪县| 河北省| 麟游县| 商水县| 宁陕县| 乌拉特中旗| 哈尔滨市| 广元市| 彩票| 三都| 娄底市| 卫辉市| 鄂尔多斯市| 安顺市| 杭州市| 博乐市| 华坪县| 宁陵县|