ch2=ch--ch=chch3
could you also explain the "cis" and "trans" part of this, if there are any involved
I got 1,3-pentadiene, but since there is a double bond in there I could be wrong, but there no way to tell if there on the same side or not.
2007-05-18 04:43:34 · 7 answers · asked by Flaming Pope 4 in Science & Mathematics ➔ Chemistry
The compound is 1,3-pentadiene, also known as Piperylene.
It is difficult in this forum to show stereoisomerism, since this is a two-dimensional medium that would need to be extended to a three-dimensional topic, but the difference between cis- and trans- compound occurs at the double bond. In a cis- compound, the groups on both sides of the double bond will either be "up" or "down", as such:
R. . . . .. R
. .\. . . ../
. . C=C
. . / . . ..\
H . . . .. .H
With a trans- compound, the groups "cross" the double bond:
R. . . . . . H
. .\. . . . ./
. . C=C
. . / . . . .\
H . . . . . .R
Since the double bond is rigid, and does not rotate, these two compounds have different chemical properties, even though they have the same empirical formula.
In the case of your 1,3-pentadiene, the cis- and trans- forms have the following physical properties:
Empirical formula = C5H8
Molecular Weight = 68.12 g/mole
Trans: MP = -87.4°C; BP = 42°C; density = 0.6710 g/cm³
Cis: MP = -140.8°C; BP = 44.1°C; density = 0.6910 g/cm³
2007-05-18 05:00:20 · answer #1 · answered by Dave_Stark 7 · 0⤊ 0⤋
The compound is called 1,3-pentadiene.
The double bond between C-1 and C-2 cannot be labeled as cis or trans, because C-1 has two H's on it. In order for a double bond to be labeled as cis or trans EACH CARBON has to have two different things attached to it.
Now look at the double bond between C-3 and C-4
On C-3, you have a hydrogen and the CH2=CH group
On C-4, you have a hydrogen and the CH3 group.
If the two H atoms are both on the same side of the double bond, then it's CIS.
If the H atoms are on opposite sides of the double bond, (across from each other diagonally) then it's TRANS.
Any more questions? Let me know. I'm glad to help.
2007-05-18 04:51:56 · answer #2 · answered by mrfarabaugh 6 · 2⤊ 0⤋
You are correct. It is 1,3-pentadiene. Without seeing a structure you cannot comment on whether it is cis or trans.
2007-05-18 04:52:49 · answer #3 · answered by Anonymous · 1⤊ 0⤋
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2016-05-22 06:35:09 · answer #4 · answered by ? 4 · 0⤊ 0⤋
1, 3, penta diene is correct. But...is it trans or cis?
2007-05-18 05:02:59 · answer #5 · answered by Top Gun 3 · 1⤊ 0⤋
1,3-pentadiene ,its correct dear.
2007-05-18 04:47:50 · answer #6 · answered by Anonymous · 2⤊ 0⤋
You have it right.
2007-05-18 04:49:07 · answer #7 · answered by Anonymous · 2⤊ 0⤋