The bond lengths show the endocyclic
N2-C7 bond is shorter than the exo cyclic N1-C7 bond, the N1-C1 bond length is quite long 1.
Reaction mechanisms of formaldehyde with endocyclic
Imino groups of nucleic acid bases.
Reaction with endocyclic
imino groups of DNA bases.
Key statement: A rubber material is described, modified with a barrier material in the form of a copolymer which can be produced via ring-opening metathesis polymerization of a) at least one olefin monomer selected from the group consisting of monocyclic olefin monomers having one or two endocyclic
C--C double bonds and bicyclic olefin monomers having one endocyclic
C--C double bond and b) at least one polycyclic olefin monomer having at least two C--C double bonds.
The visceral mass consists of a helically twisted endocyclic
type digestive tube and a centrally located axial organ.
These carbohydrate mimics substitute the endocyclic
oxygen of sugars with a basic nitrogen atom.
Hydrogenation in the presence of palladium on carbon catalyst removes the endocyclic
olefin, and the stereochemistry at the alcohol was inverted by converting it into the mesylate, which was then displaced with cesium acetate.
These studies revealed a pattern of endocyclic selection, that is, opposing directional selection episodes on gene arrangement frequencies during the life cycle.
Evidence for endocyclic selection acting on the inversion polymorphism in a natural population.
We were expecting the five-membered C-ring formation of steroidal structure of 1 since exocyclic free radical is more stable than endocyclic
 The Pd-assisted intermolecular cascade cyclization of reduced derivative of acetal 6 also favoured five-membered C-ring in a separate study in our group  The dihydroxylation of the steroidal precursor 5 followed by C-ring cleavage with Pb(OAc)4 and condensation of resulting trione would furnish the complete synthesis of steroidal backbone 4 of 1 (scheme-1).
Coverage includes the substitution of sugar hydroxyl groups; substituting glycosidic oxygen with carbon, cyclitols and carbasugars where the endocyclic
oxygen is replaced with carbon; and other types of endocyclic
1986) demonstrated endocyclic
selection, directional selection in opposing directions during the life cycle, on gene arrangements of D.