{"doi":"10.1002/cber.19791120642","title":"Phasentransferkatalysierte Wittig‐Reaktionen ohne Basenzusatz","abstract":"<jats:p><jats:bold>Basefree Wittig Reactions with Phase Transfer Catalyts</jats:bold></jats:p><jats:p>Ketones like trifluoroacetyl compounds — giving the haloform reaction in basic solutions — are able to react with mono or bis phosphonium fluorides without bases <jats:italic>via</jats:italic> Wittig reactions with very good yields. The phosphonium fluorides are prepared very easily from other phosphonium halides under phase transfer catalysis of crown ethers. The ratio of the stereoisomeric alkenes in the product and the spectra of the <jats:italic>trans</jats:italic>‐ respectively <jats:italic>trans‐trans</jats:italic> alkenes are given.</jats:p>","journal":"Chemische Berichte","year":1979,"id":37914,"datarank":0.9588916543182915,"base_score":2.70805020110221,"endowment":2.70805020110221,"self_citation_contribution":0.40620753016533157,"citation_network_contribution":0.5526841241529599,"self_endowment_contribution":0.40620753016533157,"citer_contribution":0.5526841241529599,"corpus_percentile":null,"corpus_rank":null,"citation_count":14,"citer_count":10,"citers_with_citation_signal":9,"citers_with_endowment":9,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":null,"is_data_producer":false,"deposit_databanks":null,"is_oa":false,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":null,"fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":189020,"name":"Rolf Nuck","orcid":null,"position":1,"is_corresponding":false},{"id":189019,"name":"Gerhard Koßmehl","orcid":null,"position":0,"is_corresponding":false}],"reference_count":0,"raw_metadata":{"has_enrichment":true,"base_score":2.70805020110221,"endowment":2.70805020110221,"datacite_reuse_total":0,"file_count":0,"downloads":0,"views":0,"has_version_chain":false,"is_dataset":false,"is_oa":false,"pmid":"18998881","pmcid":null,"openalex_id":"https://openalex.org/W2103704485","authors":[],"funders":[],"total_grants":0,"fwci":2.9585,"citation_percentile":0.90400628,"influential_citations":0,"citation_trend":[{"year":2012,"count":1},{"year":2023,"count":1}],"oa_status":"closed","license":"http://onlinelibrary.wiley.com/termsAndConditions#vor","oa_locations":[{"url":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fcber.19791120642","host_type":"publisher"},{"url":"https://onlinelibrary.wiley.com/doi/pdf/10.1002/cber.19791120642","host_type":"publisher"},{"url":"https://chemistry-europe.onlinelibrary.wiley.com/doi/pdf/10.1002/cber.19791120642","host_type":"publisher"},{"url":"https://doi.org/10.1002/cber.19791120642","host_type":"journal"}],"fields_of_study":["Phosphorus compounds and reactions","Synthesis and Reactivity of Sulfur-Containing Compounds","Organophosphorus compounds synthesis","Chemistry"],"mesh_terms":[],"keywords":["Wittig reaction","Chemistry","Phosphonium","Halide","Catalysis","Ylide","Organic chemistry","Medicinal chemistry"],"sdg_mappings":[{"sdg_number":0,"sdg_label":"Clean water and sanitation"}],"linked_datasets":[],"clinical_trials":[],"software_tools":[],"database_accessions":[],"source":"live","citation_network_status":"fetched"},"created_at":"2026-06-10T21:42:25.304524Z","pmid":null,"pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}