Question: in the friedel crafts acylation reaction aluminum chloride functions as a
[{'answer': 'catalyst', 'provenance': [{'wikipedia_id': '454234', 'title': 'Friedel–Crafts reaction', 'start_paragraph_id': 3, 'start_character': 189, 'end_paragraph_id': 3, 'end_character': 197, 'bleu_score': 1.0, 'section': 'Section::::Friedel–Crafts alkylation.\n'}]}, {'provenance': [{'wikipedia_id': '454234', 'title': 'Friedel–Crafts reaction', 'start_paragraph_id': 44, 'start_character': 0, 'end_paragraph_id': 44, 'end_character': 223, 'bleu_score': 0.9402297675816911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5903773944599149178}, 'section': 'Section::::Scope and variations.:Friedel–Crafts test for aromatic hydrocarbons.\n'}]}]