双键是共价键的一种,共价键,就意味着共用电子对的存在。简单的说,就是这一对电子,由键的两方各出一个,彼此共用。因此,一个共价键就可以填补一个最外层电子的空额。
双键 [物化] double bond ; double linkage ; double union ; double key
共轭双键 conjugated double bond ; conjugated bond
双键移位 [物化] double bond migration ; migration of the double bond ; double band clearing
累积双键 [物化] cumulated double bond
累积双键化合物 cumulene
双键格斗 Divekick
桥环双键 endocyclic double bond
双键烃 double-bonded hydrocarbon
内双键 internal double bond
我们来考虑一下如何划分单键、双键和三键。
Let's think about how we can classify single and double and triple bonds,.
实际上,你不能转动一个双键,它使得你的分子很坚固。
So really, you can not ever rotate a double bond, it makes your molecule very rigid.
脂肪酸被生物体转化成包含碳氧双键即羰基的醛。
The fatty acids are then converted by the organisms to an aldehyde that includes a carbon atom bonded to an oxygen atom (together they create what's called a carbonyl group).
So if we look at its length, it's actually shorter than a single bond, but longer than a double bond.
因此如果我们看它的键长的话,它实际上比单键更短,却比双键更长。
And we find the same thing for these two atoms here, it's not actually a double bond, it's somewhere between a single bond and a double bond.
而且我们发现这两个原子的情况是一样的,它其实不是一个双键,而是介于单键与双键之间的。
And something that we'll see later on is that triple bonds, for example, are going to be stronger than a corresponding double bond or a corresponding single bond.
而我们以后还会看到三键,举例来说,应该更强,相较于相应的双键,或者相应的单键来说。
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