8-methylene-7,9-dioxobicyclo<4.3.0>nonane | 114401-84-2

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 二氧戊环
• 英文名称: 8-methylene-7,9-dioxobicyclo<4.3.0>nonane
• 英文别名: 2-Methylidene-3a,4,5,6,7,7a-hexahydro-1,3-benzodioxole
• CAS: 114401-84-2
• 化学式: C₈H₁₂O₂
• 分子量: 140.182
• InChiKey: ITEGDWHMZRUCSL-UHFFFAOYSA-N

物化性质

• 沸点：
  220.1±10.0 °C(Predicted)
• 密度：
  1.05±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.1
• 重原子数：
  10
• 可旋转键数：
  0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.75
• 拓扑面积：
  18.5
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  1,2-环己二醇 在 氢氧化钾 、 Dowex 50(H⁺) 、 四丁基溴化铵 作用下， 反应 2.0h， 生成 8-methylene-7,9-dioxobicyclo<4.3.0>nonane
  参考文献：
  名称：

  外消旋和对映异构纯环烯酮缩醛的制备

  摘要：

  摘要 环烯酮缩醛已由α-卤代醛二甲基缩醛通过乙缩醛转移和随后在无溶剂条件下的PTC中消除来制备。当使用对映体纯二醇时，没有观察到外消旋化。已经研究了稳定性和储存条件。

  DOI：

  10.1080/00397919308009850

文献信息

• Polyesters by a Radical Pathway: Rationalization of the Cyclic Ketene Acetal Efficiency
  作者：Antoine Tardy、Noémie Gil、Christopher M. Plummer、Didier Siri、Didier Gigmes、Catherine Lefay、Yohann Guillaneuf

  DOI：10.1002/ange.202005114

  日期：2020.8.17

  AbstractRadical ring‐opening polymerization (rROP) of cyclic ketene acetals (CKAs) combines the advantages of both ring‐opening polymerization and radical polymerization thereby allowing the robust production of polyesters coupled with the mild polymerization conditions of a radical process. rROP was recently rejuvenated by the possibility to copolymerize CKAs with classic vinyl monomers leading to

  摘要环状乙烯酮缩醛（CKAs）的自由基开环聚合（rROP）结合了开环聚合和自由基聚合的优点，从而可以在自由基工艺的温和聚合条件下稳健地生产聚酯。最近，rROP 通过将 CKA 与经典乙烯基单体共聚的可能性而焕发活力，从而将可裂解官能团插入乙烯基共聚物主链中，从而赋予（生物）降解性。此类材料适用于广泛的应用，特别是在生物医学领域。开环和保环传播途径之间的竞争是开发高效 CKA 单体的一个主要复杂因素，最终导致仅使用四种已知在所有实验条件下完全开环的单体。在本文中，我们研究了模型 CKA 单体的自由基开环聚合，并通过使用 PREDICI 软件的 DFT 计算和动力学建模相结合证明，我们现在能够在计算机上预测 CKA 单体的开环能力。
• COPOLYMER, AND MOLDED ARTICLE
  申请人：Kuraray Co., Ltd.

  公开号：EP3095800A1

  公开（公告）日：2016-11-23

  Provided are a break-resistant copolymer having high transparency and heat resistance and also having a high tensile strain at break, and a molded article. A copolymer contains 80% by mass to 98% by mass of structural units derived from a methacrylic ester monomer and 2% to 10% by mass of ester structural units derived from a cyclic ketene acetal monomer. The copolymer has a weight average molecular weight of 80, 000 or more and a molecular weight distribution of 1. 75 to 3.80.

  本发明提供了一种具有高透明度和耐热性，同时具有高断裂拉伸应变的抗断裂共聚物，以及一种模塑制品。 一种共聚物含有 80%-98%（质量百分比）由甲基丙烯酸酯单体衍生的结构单元和 2%-10%（质量百分比）由环烯酮缩醛单体衍生的酯结构单元。共聚物的平均分子量为 80,000 或以上，分子量分布为 1.75 至 3.80。
• PREPARATION OF AN AQUEOUS DISPERSION OF COPOLYMER PARTICLES OF VINYL ACETATE AND A CYCLIC KETENE ACETAL MONOMER
  申请人：Rohm and Haas Company

  公开号：EP3722334A1

  公开（公告）日：2020-10-14

  The present invention relates to a method comprising the steps of a) contacting under emulsion polymerization conditions vinyl acetate; a cyclic ketene acetal monomer; and a monoethylenically unsaturated acid monomer or a salt thereof; to form an aqueous dispersion of copolymer particles comprising structural units of vinyl acetate, the cyclic ketene acetal, and the monoethylenically unsaturated acid monomer or a salt thereof; wherein the cyclic ketene acetal monomer is characterized by following structure: where n and the R groups are as defined herein. The method of the present invention provides a water-borne dispersion that is substantially free of volatile organic solvents and that provides a readily degradable polymer that is useful, for example, in the manufacture of biodegradable packaging products.

  本发明涉及一种方法，包括以下步骤 a) 在乳液聚合条件下，将乙酸乙烯酯、环己酮缩醛单体和单乙烯基不饱和酸单体或其盐接触，形成共聚物颗粒的水分散液，共聚物颗粒由乙酸乙烯酯、环己酮缩醛和单乙烯基不饱和酸单体或其盐的结构单元组成；其中环己酮缩醛单体的结构特征如下： 其中 n 和 R 基团如本文所定义。本发明的方法提供了一种水性分散体，该分散体基本上不含挥发性有机溶剂，并提供了一种易降解聚合物，可用于制造生物可降解包装产品等。
• AQUEOUS DISPERSION OF COPOLYMER PARTICLES OF VINYL ACETATE AND A CYCLIC KETENE ACETAL MONOMER
  申请人：Rohm and Haas Company

  公开号：EP3722341A1

  公开（公告）日：2020-10-14

  The present invention relates to a composition comprising an aqueous dispersion of copolymer particles comprising structural units of vinyl acetate, a cyclic ketene acetal monomer, and a monoethylenically unsaturated acid monomer, or a salt thereof; wherein the cyclic ketene acetal monomer is characterized by following structure: where n and the R groups are as defined herein. The composition of the present invention provides a water-borne dispersion that is substantially free of volatile organic solvents and that provides a readily degradable polymer that is useful, for example, in the manufacture of biodegradable packaging products.

  本发明涉及一种包含共聚物颗粒水分散液的组合物，共聚物颗粒包含乙酸乙烯酯、环酮缩醛单体和单乙烯基不饱和酸单体或其盐的结构单元；其中环酮缩醛单体的结构特征如下： 其中 n 和 R 基团如本文所定义。本发明的组合物提供了一种基本上不含挥发性有机溶剂的水性分散体，并提供了一种易于降解的聚合物，可用于制造可生物降解的包装产品等。
• Copolymer, and molded article
  申请人：KURARAY CO., LTD.

  公开号：US10287380B2

  公开（公告）日：2019-05-14

  Provided are a break-resistant copolymer having high transparency and heat resistance and also having a high tensile strain at break, and a molded article. A copolymer contains 80% by mass to 98% by mass of structural units derived from a methacrylic ester monomer and 2% to 10% by mass of ester structural units derived from a cyclic ketene acetal monomer. The copolymer has a weight average molecular weight of 80,000 or more and a molecular weight distribution of 1.75 to 3.80.

  本发明提供了一种具有高透明度和耐热性，同时具有高断裂拉伸应变的抗断裂共聚物，以及一种模塑制品。 一种共聚物含有 80%-98%（质量百分比）由甲基丙烯酸酯单体衍生的结构单元和 2%-10%（质量百分比）由环烯酮缩醛单体衍生的酯结构单元。共聚物的平均分子量为 80,000 或以上，分子量分布为 1.75 至 3.80。