Six novel C-3-symmetric benzoxazines (1a-f) were synthesized via a one-pot condensation, in which twelve covalent bonds were formed up to 96% yield. Two X-ray crystal structures confirmed their proposed conformations and showed their potential as a novel tri-arm molecular scaffold. (C) 2011 Elsevier Ltd. All rights reserved.
Oxazine Ring-Related Vibrational Modes of Benzoxazine Monomers Using Fully Aromatically Substituted, Deuterated, <sup>15</sup>N Isotope Exchanged, and Oxazine-Ring-Substituted Compounds and Theoretical Calculations
作者:Lu Han、Daniela Iguchi、Phwey Gil、Tyler R. Heyl、Victoria M. Sedwick、Carlos R. Arza、Seishi Ohashi、Daniel J. Lacks、Hatsuo Ishida
DOI:10.1021/acs.jpca.7b05249
日期:2017.8.24
1H nuclear magnetic resonance spectroscopy (1H NMR). The IR and Raman spectra of each compound are compared. Further analysis of 15N isotope-exchanged PH-a indicates the influence of the nitrogen isotope on the band position, both experimentally and theoretically. This finding is important for polymerization studies of benzoxazines that utilize vibrational spectroscopy.
红外光谱(IR)中960–900 cm –1谱带的消失表明了苯并恶嗪树脂的聚合。从历史上看,该谱带归属于与恶嗪环相连的苯的CH平面弯曲。这项研究表明,该带是恶嗪环的O–C 2拉伸和酚环振动模式的混合。3-苯基-3,4-二氢-2 H-苯并[ e ] [1,3]恶嗪(PH-a)和3-(叔丁基)-3,4-二氢-2 H-苯并的振动频率[ e ] [1,3]恶嗪(PH-t)与同位素交换和全取代的化合物进行比较。合成并进行了精细的研究,包括氘代苯并恶嗪单体,15种N-同位素交换的苯并恶嗪单体和全取代的不具有芳族C–H基团的苯并恶嗪单体。各种同位素交换包括苯酚的苯环周围的氘化,恶嗪环上O– CH 2 –N(2)和N– CH 2 –Ar(4)位置的每个CH 2的选择性氘化或同时氘化两个职位。化学结构通过1 H核磁共振波谱(1 H NMR)确认。比较每种化合物的IR和拉曼光谱。进一步分析在实验和理论上,15