quaternary carbon

Quaternary carbon exists widely in active natural products and drug molecules .

季碳中心广泛存在于天然产物和活性药物分子中。

Asymmetric construction of quaternary carbon centers and its application to the synthesis of natural products

季碳的不对称构筑法及其在天然产物全合成中的应用

Contribution of Pyridyl , Phenyl and Quaternary Carbon Structure to the Effective Carbon Number

吡啶、苯系物和季碳原子的有效碳数贡献研究

Semipinacol rearrangment reaction is an effective method for the construction of quaternary carbon .

半频哪醇重排反应是一个构筑多官能团化的季碳中心的有效方法。

The methods of asymmetric construction of quaternary carbon centers and its applications to the synthesis of natural products have been reviewed .

综述了季碳的不对称构筑法及其在天然产物全合成中的应用。按照合成反应不同，分7类加以介绍。

However , the construction of quaternary carbon has always been a challenge in chemistry , especially all-carbon quaternary carbon .

然而季碳的构筑一直是有机化学中非常具有挑战性的课题，尤其是全碳季碳的构筑。

Application of polarization transfer technique inept , dept and quaternary carbon pulse sequence in ~ ( 13 ) cnmr determination

极化转移INEPT与DEPT以及季碳脉冲序列等方法在~（13）CNMR测定中的应用

The chiral quaternary carbon centers are widely distributed in various bioactive natural products , and its catalytic asymmetric construction is an important research topic in organic synthesis .

手性季碳中心广泛分布于各类生物活性天然产物结构中，它的不对称催化构建是有机合成化学中的重要研究内容。

Based on this point of view , two synthetic methods for constructing the chiral quaternary carbon were developed and further applied to the total synthesis of some novel structural and active natural products .

本论文针对这一课题实现了两类手性季碳中心的构筑，并应用于具有新颖结构和良好活性的天然产物全合成研究中。

It features mild conditions and a broad substrate scope and holds great potential in constructing polycyclic indolines with tertiary and / or quaternary carbon centers that are widely present in the complex indoline alkaloids .

该反应具有温和的反应条件和广的底物范围，对构筑广泛存在于复杂的吲哚啉生物碱中的具有三碳或四碳的多环吲哚啉骨架，具有极大的潜力。

High resolution 1H and 13C-NMR spectra for PET / 30PHB and PET / 6 PHB copolyes-ters in solution have been measured . The 13C absorptions were assigned by the help of the determination of quaternary carbon absorption with INEPT and partially relaxed FT techniques .

测定了PET/30PHB和PET/60PHB共聚酯的高分辨~1H和~（13）C谱，并采用INEPT方法和部分弛豫FT技术确定了季碳吸收峰，对NMR谱进行了归属。