506
W. SANDERMANN
SCHEME I
Regular coupling of isoprene units
Irregular coupling
~c— c— c— c4
c
I
c—c—c(tail-to-head)
(a)
C
C
.
.
I
.
I
-i-C—C—C—C-=-C—C—C—C(tail-to-tail)
(b)
TABLE II
Hemiterpene Compounds (5,6)
(Π)
(in)
(IV)
(V)
>-C—COOR
Isovaleric acid
ßß-Dimethylacrylic acid
Acacipetalin
Penicillins
Samidin
Athamantin
Pyrethrins
>—C—C—OR
Isoimperatorin
Oxypeucedanin
Osthruthol
Imperatorin
Phellopterin
Byakangelicin
Evoxine
>—C—CO—R
Geigerin
Humulone
>— C—C—R
Peucenin
Auroptene
Osthole
Toddadolactone
Icariin
Lapachol
Flavoglaucin
Lomatiol
Meranzin
Suberosin
Psoralidin
Osagin
Pomiferin
Auroglaucin
\^°\^
(VI) A
If R
\>v
Evodion
Lapachenol
Seselin
Braylin
Xanthyletin
Luvangetin
Osajin
Pomiferin
Deguelin
Toxicarol
Tephrosin
Jacareubin
Rottlerin
Acronylin
Medicosmine
Mundulone
Acronidine
FUnder sin
(VII)
Marmesin
Nodakenin
Visamminol
Rotenone
Oreoselone
Peucedanin
Euparin
Oroselone
Xanthoxyletin
Athamantin