3,4-二氢-2H-吡喃-2,2-二基二甲醇 | 14278-50-3

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 氧杂环化合物
• 中文名称: 3,4-二氢-2H-吡喃-2,2-二基二甲醇
• 英文名称: 3,4-dihydro-2,2-bis(hydroxymethyl)-2H-pyran
• 英文别名: 3,4-Dihydro-2h-pyran-2,2-diyldimethanol；[2-(hydroxymethyl)-3,4-dihydropyran-2-yl]methanol
• CAS: 14278-50-3
• 化学式: C₇H₁₂O₃
• 分子量: 144.17
• InChiKey: QDGIAYURMHFNHL-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.3
• 重原子数：
  10
• 可旋转键数：
  2
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.71
• 拓扑面积：
  49.7
• 氢给体数：
  2
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  3,4-二氢-2H-吡喃-2,2-二基二甲醇 、 碘乙烷 以 N-甲基乙酰胺 为溶剂， 生成 3,4-dihydro-2,2-bis((2-ethoxy)methyl)-2H-pyran
  参考文献：
  名称：

  3-Phenylmethoxytetrahydropyran herbicides

  摘要：

  某些3-苯甲氧基四氢吡喃，可用作除草剂。

  公开号：

  US04388104A1

文献信息

• ROD SEALING SYSTEM
  申请人：NOK Corporation

  公开号：EP1959171A1

  公开（公告）日：2008-08-20

  In a rod sealing system, which comprises a buffer ring, a rod seal, and a dust seal, provided successively in this order from a fluid hydraulic side toward the outside in an annular clearance between two members in reciprocating motion, the buffer ring is made up of a thermoplastic polyurethane molding product obtained by subjecting a thermoplastic polyurethane molding product prepared by reaction of (A) a high molecular weight polycarbonatediol having a number average molecular weight Mn of 500-6,000, (B) an aromatic diisocyanate, and (C) a low molecular weight diol as a chain elongation agent in an NCO/OH ratio of 0.95-1.20,to heat treatment under conditions that a glass transition point (Tg) of hard phases becomes 170 °C or higher, preferably 170- 230 °C , and an endothermic peak area (ΔH) at Tg becomes 5J/g or more, by differential scanning calorimetry. The buffer ring made up of the thermoplastic polyurethane molding product has a distinguished heat resistance capable of withstanding the service environmental temperature, particularly maximum 120°C, compression set characteristics, follow-up to eccentricity, etc.

  在一种杆密封系统中，包括一个缓冲环、一个杆密封件和一个防尘密封件，在两个往复运动部件之间的环形间隙中从流体液压侧向外依次设置、缓冲环由热塑性聚氨酯模塑产品构成，该热塑性聚氨酯模塑产品由以下物质反应制备而成：(A) 平均分子量 Mn 为 500-6,000 的高分子量聚碳酸酯，(B) 芳香族二异氰酸酯，和 (C) 作为链延伸剂的低分子量二元醇，其 NCO/OH 比为 0.95-1.20，通过差示扫描量热法，在硬相的玻璃化转变点(Tg)变为 170℃或更高，最好是 170-230 ℃，Tg 处的内热峰面积(ΔH)变为 5J/g 或更高的条件下进行热处理。由热塑性聚氨酯模塑产品制成的缓冲环具有出色的耐热性，能够承受使用环境温度，尤其是最高 120°C，并具有压缩永久变形特性和偏心后续特性等。
• Rod Sealing System
  申请人：Matsui Noriyuki

  公开号：US20090166984A1

  公开（公告）日：2009-07-02

  In a rod sealing system, which comprises a buffer ring, a rod seal, and a dust seal, provided successively in this order from a fluid hydraulic side toward the outside in an annular clearance between two members in reciprocating motion, the buffer ring is made up of a thermoplastic polyurethane molding product obtained by subjecting a thermoplastic polyurethane molding product prepared by reaction of (A) a high molecular weight polycarbonatediol having a number average molecular weight Mn of 500-6,000, (B) an aromatic diisocyanate, and (C) a low molecular weight diol as a chain elongation agent in an NCO/OH ratio of 0.95-1.20, to heat treatment under conditions that a glass transition point (Tg) of hard phases becomes 170° C. or higher, preferably 170-230° C., and an endothermic peak area (ΔH) at Tg becomes 5 J/g or more, by differential scanning calorimetry. The buffer ring made up of the thermoplastic polyurethane molding product has a distinguished heat resistance capable of withstanding the service environmental temperature, particularly maximum 120° C., compression set characteristics, follow-up to eccentricity, etc.
• US4388104A
  申请人：——

  公开号：US4388104A

  公开（公告）日：1983-06-14
• US4870193A
  申请人：——

  公开号：US4870193A

  公开（公告）日：1989-09-26
• US8056903B2
  申请人：——

  公开号：US8056903B2

  公开（公告）日：2011-11-15