萜类化合物定义和分类
萜类化合物
1.萜类化合物的定义
从化学结构来看,萜类化合物由异戊二烯单元,C5,为基本结构单元。
从生源来看,萜类化合物的生物合成的重要前体物质是甲戊二羟酸。
定义,由甲戊二羟酸衍生,符合通式(CH)的化合物及5xn 衍生物。
异戊二烯,
甲戊二羟酸,
CHOH-CH-COH(CH)-CH-COOH 2232
2 萜类化合物的分类;
根据异戊二烯结构单元的数目划分
are some differences in level of development of the various modes of transport, leading to traffic levels have a greater imbalance. Yibin city, based on the 2008 ~2013 year of external transport of passenger and cargo traffic volume statistics. 2008 ~2013 year, Yibin city, external table 3.1-1 railways roads water transport passenger traffic passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) in 2008 ~2013 year, Yibin city, external transport railways roads water transport traffic statistics 3.1-2 time of air cargo
名称异戊二烯结构单元的数目
半萜 1
单萜 2
倍半萜 3
二萜 4
二倍半萜 5
三萜 6
三倍半萜 7
四萜 8
多聚萜 N>8
3. 萜的生源学说,“经验异戊二烯法则”和“生源异戊二烯法则”
“经验异戊二烯法则”的依据
A.大多数萜类化合物都是由异戊二烯首尾相连而成。
B.橡胶的焦化或松节油
的蒸气经氮气稀释后,在低压下通过红热的铂丝,都会得到产率很高的异戊二烯。 C.将异戊二烯加热到280度,两分子的异戊二烯聚合而成二戊烯,为典型的萜类化合物。
两分子的异戊二烯发生Deils-Alder聚合反应
are some differences in level of development of the various modes of transport, leading to traffic levels have a greater imbalance. Yibin city, based on the 2008 ~2013 year of external transport of passenger and cargo traffic volume statistics. 2008 ~2013 year, Yibin city, external table 3.1-1 railways roads water transport passenger traffic passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) in
2008 ~2013 year, Yibin city, external transport railways roads water transport traffic statistics 3.1-2 time of air cargo
得出,自然界的萜类化合物都是由异戊二烯衍生来的,是异
戊二烯的聚合体或其衍生物。
但是 r-崖柏素等不符合“经验异戊二烯法则”,确是萜类化合
物。说明“经验异戊二烯法则”的不合理。
r-崖柏素
“生源异戊二烯法则”
are some differences in level of development of the various modes of transport, leading to traffic levels have a greater imbalance. Yibin city, based on the 2008 ~2013 year of external transport of passenger and cargo traffic volume statistics. 2008 ~2013 year, Yibin city, external table 3.1-1 railways roads water transport passenger traffic passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) in
2008 ~2013 year, Yibin city, external transport railways roads water transport traffic statistics 3.1-2 time of air cargo
Ipp 和DMAPP 均能转化为半萜,也能在酶的作用下生成
单萜。
GPP 为焦磷酸香叶酯--单萜类化合物。
得出,萜类化合物的生物合成的重要前体物质为甲戊二羟
are some differences in level of development of the various modes of transport, leading to traffic levels have a greater imbalance. Yibin city, based on the 2008 ~2013 year of external transport of passenger and cargo traffic volume statistics. 2008 ~2013 year, Yibin city, external table 3.1-1 railways roads water transport passenger traffic passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) share (%) Passenger traffic (million) in 2008 ~2013 year, Yibin city, external transport railways roads water transport traffic statistics 3.1-2 time of air cargo
酸。 ,IPP 及DMAPP 是生物体内的活性异戊二烯。起延
