Georgiades added that the double bond
issue ensured savings in debt servicing and securing very long-term lending and facilitating debt management.
Key statement: Acido-basic properties of a system containing a polymer fragment obtained by oxidative cleavage of a carbon-carbon double bond
of a diene rubber polymer and a functional molecule having in a structure thereof an alkoxysilyl group and at least one functional group selected from the group consisting of an aldehyde group and a carbonyl group are changed such that the system becomes basic when acidic, and becomes acidic when basic, thereby combining the polymer fragment with the functional molecule to form a modified diene rubber polymer having an alkoxysilyl group incorporated therein.
The critical region of the test molecule consists of a carbon double bond
with an adjacent single bond(C=C-C).
The chemical feature of all haloolefins is the presence of a carbon-carbon double bond
. This carbon-carbon double bond
, in most cases, is more reactive than saturated carbon-carbon, carbon-hydrogen, and carbon-halogen (fluorine, chlorine, bromine, iodine) bonds.
1H-NMR spectrum showed the characteristic signal for olefinic proton of trisubstituted double bond
at I' 5.33 (1H, br.d J = 5.3 Hz) and trans disubstituted double bond
in which olefinic protons resonated at I' 5.17 (1H, dd, J = 15.1 and 7.7 Hz) and 5.00 (1H, dd, J = 15.4 and 7.5 Hz).
Another story looks at the potential replacement of one of butyl rubber's carbon-carbon double bonds
with a phosphorus-carbon double bond
, allowing for chemical transformation of this rubber polymer.
The key components of an MA system are electron deficient C=C double bonds
(e.g., an acryloyl, the acceptor), acidic C-H bonds (as present in aceto-acetate and malonate moieties, the donor), and a base catalyst strong enough to abstract the proton of this C-H bond yielding a nucleophilic carbanion that can add to the double bond
Trans-fats are hydrogenated fatty acid that lost their double bond
to become solidified and more stable to oxidation.
Chemical (DBC), a manufacturer of photoinitiators and oligomers recently launched DM527 and DM528 resins.
In the two polymerization processes, NMR analyses confirmed that the reaction occurred involving both the terminal acrylic double bond
and the conjugated double bonds
of the aliphatic chain.
The GMO double bond
is located at the center of the molecules' lipophilic tail.
To explain the favored stereoselectivity to the [beta] methyl position, we speculate that there is a competition for the [pi] Ru complex above or below the plane of the terminal double bond
, with a more efficient internal H addition from below giving a sigma alkyl Ru complex with the primary terminal carbon and the reductive elimination to form the final hydrogenated product adding the final hydrogen from the same side of the sigma alkyl complex [9,15].