alder
英['ɔːldə(r)]
美['ɔːldər]
TOEFL
Noun:
-
wood of any of various alder trees; resistant to underwater rot; used for bridges etc
-
north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant
- 1. Modification for synthetic purposes on the Diels - Alder adducts 56 and 62 has only rarely been considered.
- 为了达到合成的目的,对Diels-Alder加 成物(56)和(62)加以改造的问题很少有人考虑.
来自辞典例句
- 2. Diels — Alder reaction is one of the important research content in the fields of organic chemistry.
- Diels—Alder反应是目前有机化学领域重要研究内容之一.
来自互联网
- 3. Activated olefinic bond Amine, thiol radical initiator, cationic initiator, dienes ( Diels - alder reactive ).
- 活性烯键胺, 巯基,引发剂, 阳离子引发剂, 烯烃 ( 的Diels-Alder反应 ).
来自互联网
- 4. They were principally used to catalyze aldol, allylation, Diels - Alder, ene and Friedel - Crafts reactions.
- 它们主要被用来催化Aldol, 烯丙基化, Diels-Alder, Ene和 Friedel -Crafts等反应.
来自互联网
- 5. Diels - Alder reaction of 2 - merhylene - 1 - pheny 1 - 1.3 - butanedione catalysed by zinc chloride as lewis acid with 1.3 - cylcopentadiene was reported.
- 以氯化锌为路易斯酸催化剂,探讨了2 ─ 亚甲基─1 ─ 苯基 ─ 1.3 ─ 丁二酮与1.3 ─ 环戊二烯的Diels─Alder反应.
来自互联网
用作名词 (n.)
- Alder trees belong to the birch family.
赤杨属于桦木科。
