Derivatives of phenyl tribromomethyl sulfone as novel compounds with potential pesticidal activity

• Krzysztof M. Borys,
• Maciej D. Korzyński and
• Zbigniew Ochal

Beilstein J. Org. Chem. 2012, 8, 259–265, doi:10.3762/bjoc.8.27

• reducing agent. However, this method proceeded solely to debromination, and 4-dibromomethylsulfonyl-1,2-diamine (10) was isolated exclusively. Bromine cleavage in phenyl tribromomethyl sulfones was previously observed also by Fields and Shechter [13], who investigated the addition of phenyl tribromomethyl

Fifty years of oxacalix[3]arenes: A review

• Kevin Cottet,
• Paula M. Marcos and
• Peter J. Cragg

Beilstein J. Org. Chem. 2012, 8, 201–226, doi:10.3762/bjoc.8.22

• ]arene chemistry as debromination of 31 allowed the introduction of new groups in the vacant para-position via the mono-unsubstituted derivative 32 as shown in Scheme 17. The route introduced nitro (33), azide (34), imidazole (35), phthalimide (36), cyano (37) and methoxyether (38) groups, linked to one

The arene–alkene photocycloaddition

• Ursula Streit and
• Christian G. Bochet

Beilstein J. Org. Chem. 2011, 7, 525–542, doi:10.3762/bjoc.7.61

• ]. Rearrangement of the resulting allylic bromide to the more stable regioisomer at this stage occurs readily and debromination can be achieved on treatment with tributyltin hydride. Penkett has shown that 3-chloroperbenzoic acid (m-CPBA) can take the role of an electrophile in the epoxidation of the double bond

Novel loop-like aromatic compounds: a further step on the road to nanobelts and nanotubes

• Venkataramana Rajuri,
• Dariush Ajami,
• Gaston R. Schaller,
• Christian Näther and
• Rainer Herges

Beilstein J. Org. Chem. 2010, 6, No. 30, doi:10.3762/bjoc.6.30

• product 3. The reaction of diene 9 with the quinoid bridgehead double bond of 7 gives 2. In this case the Diels–Alder reaction is followed by a debromination in combination with an electrocyclic ring opening. Compounds 2 and 3, as well as the parent 1, belong to the class of [12]annulenes and therefore

Development of potential manufacturing routes for substituted thiophenes – Preparation of halogenated 2-thiophenecarboxylic acid derivatives as building blocks for a new family of 2,6-dihaloaryl 1,2,4-triazole insecticides

• John W. Hull Jr.,
• Duane R. Romer,
• David E. Podhorez,
• Mezzie L. Ash and
• Christine H. Brady

Beilstein J. Org. Chem. 2007, 3, No. 23, doi:10.1186/1860-5397-3-23

• /debromination procedure developed for 3-methylthiophene gave 2,4-dibromo-3-methylthiophene. Carboxylic acid functionality was then introduced either by a Grignard metallation followed by carbonation with CO2, or by a palladium catalyzed carbonylation procedure under CO pressure. The vapor phase chlorination of

• the bromination of 4. [11] Our initial approach was to attempt a bromination/debromination sequence on 5 to prepare the acid precursor of 1, a process that would give 1 from 5 in three chemical steps. However, treatment of 5 with bromine gave tribromide 6 via a bromination/decarboxylation sequence, a

• investigated in this study. Initially, the commercially available 3-methylthiophene-2-carboxylic acid 5 was chosen as the starting material. With this approach, the failure of a bromination/debromination scheme to give 19 directly led initially to a more indirect route through the nitrile 16. The 2