Mechanochemical Birch Reduction with Low Reactive Alkaline Earth Metals
作者:Jagadeesh Varma Nallaparaju、Riin Satsi、Danylo Merzhyievskyi、Tatsiana Jarg、Riina Aav、Dzmitry G. Kananovich
DOI:10.1002/anie.202319449
日期:2024.5.13
Mechanochemical activation boosts reducing power of magnesium and calcium, allowing to utilize these metals as expedient reductants in ammonia-free Birch reaction in a ball mill at ambient conditions.
Sinus thrombosis has rarely been associated with closed head injury; more often, thrombosis of the sigmoid or transverse sinus is caused by otogenic inflammations or tumours, or occurs during pregnancy. Symptoms are frequently vague, while untreated thrombus progression may be fatal due to venous congestion and infarction. We report a 32-year-old man presenting with right hearing loss, tinnitus and headache 2 days after a closed head injury. Neurological examination showed no additional abnormality. The EEG showed focal bifrontal slowing. CT revealed a fracture of the occipital bone. MRI and MRA demonstrated complete thrombosis of the right sigmoid and transverse sinuses. After 2 weeks of intravenous heparin therapy followed by warfarin, the patient's hearing improved and MRI and MRA showed complete recanalisation of the sigmoid and transverse sinuses. Venous sinus thrombosis can be an undetected sequel to head injury. Appropriate imaging studies should be carried out to enable therapy to be started as soon as possible.