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Robot Vacuum Cleaners - Which Ones Are the Best? Many robots can be controlled remotely via apps or voice commands. Select a model with a large dust bin and a long-lasting battery. Some models can be recharged and continue cleaning right where they left off This feature is especially beneficial for homes with larger spaces. The most efficient robot vacuums can help you to keep your home tidy. They can also save you time and energy. They're easy to use Robot technology is here to remain. From

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The combination of catalytic aqueous hydrochloric acid (HCl) and N-bromosuccinimide (NBS) generated electrophilic bromine monochloride (BrCl), which readily induced spiroannulation of 2-alkynolyl anilides (n = 1-3) to form gem-dibromospirocyclic benzo[d][1,3]oxazines in up to 92% yield. The reaction occurred under mild and metal-free conditions using EtOAc as a green solvent. The resulted spirocyclic products contained benzo[d][1,3]oxazine, which was useful both as a pharmacophore and synthetic precursor. In addition, the current protocol