The short range molecular structure of ogarose in the sol state and r-carrageenans in the gel state have been investigated by small-angle neutron scattering (0.1< q(nm'l) < 2.5). Agarose in the sol state possesses a rod-like conformation (minimum persistence length of 14 nm) with a mass per unit length consistent with a single helm The existence of a double helix in the gel state is accordingly...

the purpose of this report is to present a rare case of a fused mandibular lateral incisor with supernumerary tooth with a follow-up for 18-months. a 35-year-old female patient was referred to our clinic with an extraoral sinus tract in the chin. the intraoral diagnosis revealed the fusion of her mandibular lateral incisors. vitality pulp tests were negative for mandibular right central and lat...

THE TITLE COMPOUND [SYSTEMATIC NAME: (R)-2-trichloro-methyl-3a,3b,7a,8a-tetra-hydro-5H-pyrano[2',3':4,5]furano[2,3-d][1,3]dioxol-5-one], C(9)H(7)Cl(3)O(5), a triyclic system that contains a central α-d-furan-ose ring cis-fused with a dioxolane ring as well as a δ-lactone ring, exhibits a twisted conformation. The CCl(3) group has an axial orientation. The furan-ose ring approximates an envelope...

The fluorous traceless synthesis of substituted indole alkaloids is carried out first by attaching the 3-(perfluorooctyl)propanol with Boc protected L-tryptophan. The reaction of perfluoroalkyl (Rfh)-tagged tryptophan esters with various aldehydes undergoes Pictet-Spengler reaction to give cis and trans stereoisomers of tetrahydro-beta-carbolines. The nucleophilic addition of the piperidine nit...

In the title compound, C(26)H(30)N(2)O(4)S·H(2)O, the pyrrolidine and dihydro-pyran rings adopt envelope conformations and they are cis-fused. The sulfonyl group has a distorted tetra-hedral geometry. In the crystal structure, the mol-ecules are linked into a ribbon-like structure along the a axis by O/C-H⋯O hydrogen bonds involving water mol-ecules and C-H⋯π inter-actions involving the sulfony...

A new annulation strategy for the synthesis of trans-bicyclic sulfamides is described. The Pd-catalyzed alkene carboamination reactions of 2-allyl and cis-2,5-diallyl pyrrolidinyl sulfamides with aryl and alkenyl triflates afford the fused bicyclic compounds in good yields and with good diastereoselectivity (up to 13:1 dr). Importantly, by employing reaction conditions that favor an anti-aminop...