PATENT CLAIM ANALYSIS

Application Number: 16146275
Application Type: Utility
Filing Date: 2018-09
Publication Date: 2019-03
Patent Classification: ["556", "053000"]

Abstract:
The present invention relates to a new process for the synthesis of 2,3,4,5,6,7-substituted indenes, which are useful precursors for the formation of certain ansa-metallocene catalysts.

Claim (Index 13):
A process for forming a compound of formula II wherein\n R 1 , R 2  are each (1-10C)alkyl; and \n L is a bridging group of the formula \u2014[C(R x R y )] n \u2014 wherein n is 1, 2 or 3 and R x  and R y  are each independently hydrogen, (1-6C)alkyl, (2-6C)alkenyl, (2-6C)alkynyl or (1-6C)alkoxy; or a group \u2014SiR a R b  wherein R a  and R b  are each independently selected from (1-6C)alkyl, (2-6C)alkenyl, (2-6C)alkynyl, (1-6C)alkoxy or phenyl; \n wherein the process comprises:\n (i) forming a compound of formula I by a process comprising the steps of:\n (a) reacting a compound of formula A: \n \n \u2003wherein R 1  and R 2  are each as defined above; \u2003with a chlorinating or brominating agent to form a compound of formula B: \u2003wherein R 1  and R 2  are each as defined above and X is chloro or bromo; \u2003and adding 1,2,3,4-tetramethylbenzene and a Lewis acid catalyst to the reaction mixture to react with compound B to form a compound of formula C: \u2003wherein R 1  and R 2  are each as defined above; (b) reacting the compound of formula C with a solution of a hydride transfer reagent followed by adding a dehydrating agent to the reaction mixture to form a compound of formula I shown below: \u2003wherein R 1  and R 2  are each as defined above; (ii) reacting the compound of formula I with an organolithium, organosodium or organopotassium compound of the formula:\n MQ \n \u2003wherein M is lithium, sodium, or potassium and Q is an (1-6C)alkyl or aryl group; \u2003to form a compound of formula D shown below: (iii) reacting two equivalents of a compound of formula D shown above with one equivalent of a compound having formula E shown below:\n Z 1 -L-Z 2 \u2003\u2003 (E) \n \n \u2003wherein L is as defined above and Z 1  and Z 2  are leaving groups to form a compound of formula II.

Metadata:
- Claim Count in Document: 26.0
- Percentile: 97.0
- Lexical Diversity: 1.125
- Patent Class: 556.0
- Transitional Phrase Type: open
- Component Type: 1
- Foreign Priority: True
- Related Applications: ['15542756', '14781844', '13393767', '12593879', '15748557']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7370463314103269
- 35 USC 102 Novelty (BERT): 0.4939377069364491
- Combined Prediction Score: 0.7127354689629392
- Mean Citation Score: 248.932456
- Max Citation Score: 255.69185
- Similarity Product: 191.7539214057028

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 1
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test