Nonclassical thieno[ 3,4-c][1,2,5]thiadiazole

Thieno[3,4-$\text{c}$][1,2,5]thiadiazole was generated by the dehydration of the corresponding sulfoxide $\text{8}$ and characterized by the isolation of its dimer and adducts.     

Alkaline hydrolysis of 2-(trifluoromethyl)imidazo[4,5-f] and -[4,5-h]quinolines

2-(Trifluoromethyl)imidazo[4,5-$\text{f}$] and -[4,5-$\text{h}$]quinoline have been prepared from 5(6),acetamido-2-(trifluoromethyl)benzimidazole and 7,8-diaminoquinoline respectively. These (trifluoromethyl)- quinolines like 2-(trifluoromethyl)imidazoles but unlike 2-(trifluoromethyl) benzimidazoles, undergo hydrolysis in dilute sodium hydroxide to give ultimately the corresponding imidazo[4,5-$\text{f}$] and -[4,5-$\text{h}$]- quinoline, respectively.     

Epimerization of bicyclic vinyl tertiary-alcohols via [2,3] sigmatropic rearrangement

General methods for inverting the stereochemisty of vinyl $\text{tertiary}$-alcohols such as $\text{2}$ and $\text{5}$ into $\text{3}$ and $\text{8}$ respectively are described. The procedures employ a [2,3] sulfoxide rearrangement and will facilitate the extended use of the oxy-Cope rearrangement to a variety of related ring systems.     

Efficient oxygen-atom transfer agent: photochemical hydroxylation of benzene derivatives by pyrimido[5,4-g]pteridine n-oxide

Pyrimido[5,4-$\text{g}$]pteridine $\text{N}$-oxide (1) oxidizes efficiently benzene, toluene, and anisole under UV irradiation to give the corresponding phenol derivatives 4, though the easiness of the reaction significantly depends upon the nature of the substituents on the benzene ring.     

Electronic spectra of 12-S-CIS conformationally locked retinals

The electronic absorption spectra of the four new 12-$\text{s}$-$\text{cis}$-locked retinals (1a–1d) bearing 7-$\text{trans}$, 11-$\text{trans}$ double bond geometries are described and compared with those of analogous 7-$\text{trans}$, 11-$\text{cis}$-geometries (1e–1h) and parent retinals (2a-h).     

Aromatic substitution and addition reactions of 1H-cyclobuta[de]naphthalenes

1$\text{H}$-Cyclobuta[$\text{de}$]naphthalenes undergo electrophilic substitutions at their C-4 and their C-5 positions; photolytic bromination of 1$\text{H}$-cyclobuta[$\text{de}$]naphthalene yields 1,2,3,4 tetrabromo-1,2,3,4-tetrahydro-1$\text{H}$-cyclobuta[$\text{de}$]naphthalene.     

Synthesis of both 2,3-erythro- and 2,3-threo- isomers of aplidiasphingosine,a bioactive marine terpenoid

2,3-$\text{threo}$- and 13,14-$\text{erythro}$-Relative configurations were proposed for aplidiasphingosine by synthesizing both its 2,3-erythro- and 2,3-$\text{threo}$- isomers and examining their ¹³c-NMR spectra.