This mono-cis-isomer could possibly be a cis-isomer
at position 5 on the quinic acid unit.
(1,7,8) Reclaimed French oak in particular contained higher proportions of the trans-isomer of oak lactone rather than the cis-isomer
; whereas reclaimed American oak predominantly contained cis-oak lactone.
From analytical PES in (8), we have estimated local trans-isomer at DD1 = -164.3[degrees] and DD2 = 36.7[degrees] with energy 1.72 eV below OBF-CI, and local cis-isomer
at DD1 = -39.2[degrees] and DD2 = 50.9[degrees] with energy 1.28 eV below OBF-CI.
The deprotonation step, starting from the trans-[PdL.sub.2]ArX complex, is usually accepted as the dominant reaction pathway [4,23-25], but at the same time a similar reaction can take place with the corresponding cis-isomer
, which is especially important for chelating ligands, where the formation of trans-[PdL.sub.2]ArX is not possible .
Higher temperature gave more of the thermodynamically stable trans-isomer products, while lower temperatures resulted in fast formation of the kinetically favored cis-isomer
products (94% yield), (Table 4, Entry 1).
As per literature , cis-isomer
is more preferable for hydrogen production, because dehydrogenation rate of cis-decalin is faster than that of trans-decalin ; cis-decalin can also be used to produce sebacic acid that is used in the manufacture of 6,10-Nylon and softeners .
Fermented to the same high quality as that available from Japan, the product is a "natural," all-trans CoQ10 with no cis-isomer
The acute toxicity of the cis-isomer
in the rat LD50 160-300 mg/kg body weight is much higher than that of the trans-isomer LD50 > 2000 mg/kg.
As shown in Table 1, the proportion of cis-isomer
decreases as the size and bulk of the alcohol solvent increases.
The activity of the cis-isomer
is 7 times weaker, probably because of its nonplanar conformation.
Cis-oak lactone and trans-oak lactone: The cis-isomer
is more powerfully aromatic than the trans-isomer.
The predominance of cis-isomers
bioaccumulation was widely observed in all species, with R cis/trans varying between 0.60 and 29.7.