3,4-Bis(4-meth­oxy­phen­yl)-2,5-dihydro-1H-pyrrole-2,5-dione

In the title compound, C18H15NO4, the benzene rings form quite different dihedral angles [16.07 (1) and 59.50 (1)°] with the central pyrrole ring, indicating a twisted mol­ecule. Conjugation is indicated between the five- and six-membered rings by the lengths of the C—C bonds which link them [1.462 (3) and 1.477 (3) Å]. The most prominent feature of the crystal packing is the formation of inversion dimers via eight-membered {⋯HNCO}2 synthons

3,4-Bis[4-(4-meth­oxy­phen­oxy)phen­yl]-1-methyl-1H-pyrrole-2,5-dione

The title compound, C31H25NO6, has a structure related to other 3,4-diaryl-substituted maleic anhydride derivatives which have been shown to be useful as photochromic materials. The dihedral angles between the maleimide ring system and the benzene rings bonded to it are 44.48 (3) and 17.89 (3)°, while the angles between each of the latter rings and the corresponding ether bridging connected meth­oxy­benzene rings are 78.61 (8) and 72.67 (7)°. In the crystal, the molecules are linked by C—H⋯O inter­actions

Phenyl 3-meth­oxy-4-phen­oxy­benzoate

In the title mol­ecule, C20H16O4, the two outermost phenyl rings form dihedral angles of 79.80 (7) and 69.35 (7)° with the central benzene ring. In the crystal structure, weak inter­molecular C—H⋯O inter­actions link the mol­ecules into ribbons propagating along [10]

Improved Synthesis of 5-Substituted 1H-Tetrazoles via the [3+2] Cycloaddition of Nitriles and Sodium Azide Catalyzed by Silica Sulfuric Acid

A silica supported sulfuric acid catalyzed [3+2] cycloaddition of nitriles and sodium azide to form 5-substituted 1H-tetrazoles is described. The protocol can provide a series of 5-substituted 1H-tetrazoles using silica sulfuric acid from nitriles and sodium azide in DMF in 72%–95% yield

Rhenium-Catalyzed Regiodivergent Addition of Indoles to Terminal Alkynes

An efficient rhenium-catalyzed site-switchable addition of indoles to terminal alkynes is described. A variety of bisindolylalkane derivatives are expeditiously synthesized in high yields with excellent regioselectivity. Preliminary mechanistic study sheds light on the observed regiodivergent addition

Preparing (Multi)Fluoroarenes as Building Blocks for Synthesis: Nickel-Catalyzed Borylation of Polyfluoroarenes via C–F Bond Cleavage

The [Ni­(IMes)₂]-catalyzed transformation of fluoroarenes into arylboronic acid pinacol esters via C–F bond activation and transmetalation with bis­(pinacolato)­diboron (B₂pin₂) is reported. Various partially fluorinated arenes with different degrees of fluorination were converted into their corresponding boronate esters